Add nim implementation

nim/.devcontainer/devcontainer.json

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+{
+    "name": "UmbraTypes",
+    "image": "nimlang/nim",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "NimLang.nimlang", //Nim lang extension
+                "vadimcn.vscode-lldb", //for Nim debug
+                "streetsidesoftware.code-spell-checker" //spell checker
+            ]
+        }
+    },
+    "postCreateCommand": "./.devcontainer/post_create.sh"
+}

nim/.devcontainer/post_create.sh

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+nimble install nimlangserver

nim/.gitignore

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+nimble.develop
+nimble.paths

nim/chat_types.nimble

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+# Package
+
+version       = "0.1.0"
+author        = "jazzz"
+description   = "Type definitions for the chat protocol"
+license       = "MIT"
+srcDir        = "src"
+bin    = @["dev"]   # Remove
+
+# Dependencies
+requires "nim >= 2.0.14"
+requires "chronicles"
+requires "protobuf_serialization"

nim/config.nims

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+# begin Nimble config (version 2)
+when withDir(thisDir(), system.fileExists("nimble.paths")):
+  include "nimble.paths"
+# end Nimble config

nim/src/chat_types.nim

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+import protobuf_serialization
+import protobuf_serialization/proto_parser
+
+import_proto3 "../../proto/umbra/base.proto"
+
+export protobuf_serialization
+
+# TODO: Do the Objects have to be listed manually?
+export HistoryEntry

nim/tests/config.nims

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+switch("path", "$projectDir/../src")

nim/tests/test_encoding.nim

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+import unittest
+
+import chat_types
+
+suite "Type Encoding Tests":
+  test "HistoryEntry roundtrip": 
+    let x = chat_types.HistoryEntry(message_id: "12345", retrieval_hint: @[1'u8, 2, 3, 255])
+    let encoded = Protobuf.encode(x)
+    let decoded = Protobuf.decode(encoded, HistoryEntry)
+
+    check x.message_id == decoded.message_id
+    check x.retrieval_hint == decoded.retrieval_hint
+    check x == decoded
+
+  test "Multiplication works":
+    check(2 * 3 == 6)