8.2
[Messenger] Use CPP
[Messenger] Add `MessageSentToTransportsEvent`
[Messenger] Simplify code
[Messenger] Add types to private properties
Mark all dispatched event classes as final
Merge branch '5.4' into 6.3
[Messenger] dispatch event when a message is retried
[Messenger] Allow to skip message in FailedMessagesRetryCommand
Fix executable bit
[Messenger] Improve PostgreSQL LISTEN/NOTIFY idle listener