Add github actions for PR and issue labeling (#8709)

* Added Issue Labeler, PR labeler, .github readme
* Updated README with Issue Template information, and regex to metrics
Co-authored-by: Kit Patella <kit@jepsen.io>

.github/README.md

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+# Consul GitHub Configuration
+
+## Overview
+
+This file helps track the configuration of the `.github/` folder.
+
+## Issue Templates
+
+Issue templates are stored in `.github/ISSUE_TEMPLATE/` and follow the
+[documentation](https://docs.github.com/en/github/building-a-strong-community/using-templates-to-encourage-useful-issues-and-pull-requests).
+The `.github/ISSUE_TEMPLATE/config.yml` controls links out to other support
+resources.
+
+## GitHub Actions
+
+GitHub Actions provides a pluggable architecture for creating simple automation.
+An Action is made of at least two files, the `workflow` file and a config file.
+All workflows are stored in `.github/workflows/`. Configuration files are stored
+one directory higher, in `.github/`. The workflow and the configuration file
+should be named the same when created. Create unique and clear names for these
+files.
+
+### Issue Labeler
+
+Issues are labeled with
+[RegEx Labeler](https://github.com/marketplace/actions/regex-issue-labeler).
+This action supports simple regexes, and most string parsing.
+
+### PR Labeler
+
+PRs are labeled with [labeler](https://github.com/actions/labeler) action.
+This supports glob parsing so that labels can be applied to changed files.
+
+## Considered Actions
+
+- [super-labeler-action](https://github.com/IvanFon/super-labeler-action) is an action that holds all the configuration in a single file. In setting up a basic configuration with 60 labels, the JSON config became ~1200 lines. This solution may be feaseable in the future, but wouldn't seem as scaleable. This also creates a single point of failure for the entire labeling system.
+
+- [actions-label-commenter](https://github.com/peaceiris/actions-label-commenter) is an action that just responds based on tags, rather than tagging them as they come in. This would be helpful for responses for reoccuring types of messages.
+
+- [top-issues-labeler](https://github.com/marketplace/actions/top-issues-labeler) labels the top ten issues based on number of :+1: 's on an inssue.

.github/issue-labeler.yml

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+# archived/webui:
+# backport/1.6:
+# backport/1.7:
+# backport/1.8:
+# beta/1.8:
+# blocks-release:
+# crash:
+# do-not-merge:
+# help-wanted:
+# needs-discussion:
+# needs-investigation:
+# post-beta:
+# pr/dependencies:
+# pr/needs-rebase:
+# pr/needs-tests:
+theme/acls:
+    - '(acl|ACL)'
+# theme/agent-cache:
+# theme/api:
+theme/catalog:
+    - '(catalog|Catalog)'
+theme/certificates:
+    - '(certificate|CA|Certificate\sAuthority)'
+theme/cli:
+    - '(command-line|commandline|cli|command)'
+theme/config:
+    - '(configuration_files|options#configuration_files)'
+theme/connect:
+    - '(Connect|connect|service\smesh|mesh|proxy|gateway)'
+theme/consul-nomad:
+    - '(nomad|Nomad)'
+theme/consul-vault:
+    - '(vault|Vault)'
+# theme/contributing:
+theme/dns:
+    - '(dns|DNS)'
+theme/envoy/xds:
+    - '(envoy|xds|xDS|XDS|Envoy)'
+theme/federation-usability:
+    - '(WAN|wan|wan_fed|federation|fed)'
+# theme/go-modules:
+theme/health-checks:
+    - '(health-check|healthcheck|health\scheck)'
+theme/ingress-gw:
+    - '(ingress|ingress-gateway|Ingress)'
+# thementernal-cleanup:
+theme/internals:
+    - '(raft|RAFT|SERF|serf|lifeguard|Lifeguard|gossip)'
+theme/kubernetes:
+    - '(kubernetes|k8s|helm)'
+theme/mesh-gw:
+    - 'mesh'
+# theme/operator-usability:
+theme/packaging:
+    - '(nix|Nix|RPM|rpm|DEB|deb|repository|systemd|upstart|Upstart|SystemD|brew|homebrew|choco|chocolatey)'
+theme/performance:
+    - '(performance|requests\sper\ssecond)'
+theme/service-metadata:
+    - '(meta-data|meta)'
+theme/streaming:
+    - '(stream|streaming)'
+theme/telemetry:
+    - '(circonis|statsd|dogstatsd|datadog|DataDog|prometheus|Prometheus|metric|metrics|trace|tracing)'
+theme/terminating-gw:
+    - 'terminating'
+theme/testing:
+    - '(unit\stest|functional\stest|integration\stest|e2e|E2E)'
+theme/tls:
+    - '(mtls|mTLS|tls|TLS)'
+theme/ui:
+    - '(ui|browser|chrome|firefox|IE|ie|Chrome)'
+theme/windows:
+    - '(windows|Windows|Microsoft|microsoft)'
+# thinking:
+# type/bug:
+type/ci:
+    - '(circle|circleci|CircleCI)'
+# type/crash:
+type/docs:
+    - '(docs\/|docs|consul\.io)'
+# type/docs-cherrypick:
+type/enhancement:
+    - '(new\sfeature|feature|feature\srequest)'
+# type/good-first-issue:
+# type/question:
+# type/umbrella-☂️:
+# version/0.8.3:
+# waiting-pr-merge:
+# waiting-reply:
+# waiting-reply-🤖:

.github/pr-labeler.yml

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+# backport/1.6:
+# backport/1.7:
+# backport/1.8:
+# beta/1.8:
+# blocks-release:
+# crash:
+# do-not-merge:
+# help-wanted:
+# needs-discussion:
+# needs-investigation:
+# post-beta:
+pr/dependencies:
+    - vendor/**/*
+    - go.*
+# pr/needs-rebase:
+# pr/needs-tests:
+theme/acls:
+    - acl/**/*
+theme/agent-cache:
+    - agent/cache/**/*
+theme/api:
+    - api/**/*
+theme/catalog:
+    - agent/catalog/**/*
+theme/certificates:
+    - tlsutil/**/*
+theme/cli:
+    - command/**/*
+theme/config:
+    - agent/config/**/*
+theme/connect:
+    - connect/**/*
+    - agent/connect/**/*
+# theme/consul-nomad:
+# theme/consul-vault:
+theme/contributing:
+    - .github/**/*
+theme/dns:
+    - dns/**/*
+theme/envoy/xds:
+    - agent/xds/**/*
+# theme/federation-usability:
+theme/health-checks:
+    - agent/health*
+    - api/health*
+# theme/ingress-gw:
+# theme/internal-cleanup:
+theme/internals:
+    - lib/**/*
+    - types/**/*
+# theme/kubernetes:
+# theme/mesh-gw:
+# theme/operator-usability:
+# theme/performance:
+# theme/service-metadata:
+# theme/streaming:
+theme/telemetry:
+    - logging/**/*
+# theme/terminating-gw:
+theme/testing:
+    - ./*test*/**/*
+theme/tls:
+    - tlsutil/**/*
+theme/ui:
+    - ui-v2/**/*
+# theme/windows:
+# thinking:
+# type/bug:
+type/ci:
+    - .circleci/*
+# type/crash:
+type/docs:
+    - website/**/*
+type/docs-cherrypick:
+    - website/**/*
+# type/enhancement:
+# type/good-first-issue:
+# type/question:
+# type/umbrella-☂️:
+# version/0.8.3:
+# waiting-pr-merge:
+# waiting-reply:
+# waiting-reply-🤖:

.github/workflows/issue-labeler.yml

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+name: "Issue Labeler"
+on:
+  issues:
+    types: [opened, edited]
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: github/issue-labeler@v2.2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        configuration-path: .github/issue-labeler.yml
+        not-before: "2020-09-14T08:23:00Z"
+        enable-versioned-regex: 0

.github/workflows/pr-labeler.yml

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+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@main
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        configuration-path: .github/pr-labeler.yml
+        sync-labels: false