MatrixRTC: Rename `MembershipConfig` parameters (#4714)

* Remove redundant sendDelayedEventAction
We do already have the state `hasMemberEvent` that allows to distinguish the two cases. No need to create two dedicated actions.

* fix missing return

* Make membership manager an event emitter to inform about status updates.
 - deprecate isJoined (replaced by isActivated)
 - move Interface types to types.ts

* add tests for status updates.

* lint

* test "reschedules delayed leave event" in case the delayed event gets canceled

* review

* fix types

* prettier

* fix legacy membership manager

* remove deprecated jitter.

* use non deprecated config fields (keep deprecated fields as fallback)

* update tests to test non deprecated names

* make local NewMembershipManager variable names consistent with config

* make LegacyMembershipManger local variables consistent with config

* comments and rename `networkErrorLocalRetryMs` -> `networkErrorRetryMs`

* review