* 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
* deep changes in libwaku to adap to nim-ffi
* start using ffi pragma in library
* update some binding examples
* add missing declare_lib.nim file
* properly rename api files in library folder
