* Introduce api/send
Added events and requests for support.
Reworked delivery_monitor into a featured devlivery_service, that
- supports relay publish and lightpush depending on configuration but with fallback options
- if available and configured it utilizes store api to confirm message delivery
- emits message delivery events accordingly
prepare for use in api_example
* Fix edge mode config and test added
* Fix some import issues, start and stop waku shall not throw exception but return with result properly
* Utlize sync RequestBroker, adapt to non-async broker usage and gcsafe where appropriate, removed leftover
* add api_example app to examples2
* Adapt after merge from master
* Adapt code for using broker context
* Fix brokerCtx settings for all usedbrokers, cover locked node init
* Various fixes upon test failures. Added initial of subscribe API and auto-subscribe for send api
* More test added
* Fix multi propagate event emit, fix fail send test case
* Fix rebase
* Fix PushMessageHandlers in tests
* adapt libwaku to api changes
* Fix relay test by adapting publish return error in case NoPeersToPublish
* Addressing all remaining review findings. Removed leftovers. Fixed loggings and typos
* Fix rln relay broker, missed brokerCtx
* Fix rest relay test failed, due to publish will fail if no peer avail
* ignore anvil test state file
* Make terst_wakunode_rln_relay broker context aware to fix
* Fix waku rln tests by having them broker context aware
* fix typo in test_app.nim
* message.nim: set max message size to 150KiB according to spec
Using KiB instead of KB because that seems more aligned with
the actual default defined in nim-libp2p (1024 * 1024)
Spec details: https://rfc.vac.dev/spec/64/#message-size
* test_protocol.nim: align test to current WakuMessage limit
* test_waku_client.nim: adapt test to MaxWakuMessageSize change
* make maxMessageSize configurable for wakunode2
* wakunode2 app now accepts max-num-bytes-msg-size with KiB, KB, or B units
* testlib/wakunode.nim: set maxMessageSize: "1024 KiB"
* test_waku_client.nim: remove duplicate check in "Valid Payload Sizes"
* set DefaultMaxWakuMessageSizeStr as the only source of truth
* external_config.nim: rename max-num-bytes-msg-size -> max-msg-size
