* Implement most of the new MLS test framework
* Automatically keep track of clients in the group
* Assert that add proposal is forwarded
* Remove dead code
* Keep track of clients in the test state
* Port more external proposal tests to new framework
* Refactor test testSenderNotInConversation
- Also add a utility for creating an application message
* Port welcome tests to new MLS test framework
* Refactor test testSendAnotherUsersCommit
* Port some commit tests to new MLS test framework
* Port more commit tests
* Refactor test testAppMessage
* Refactor test testRemoteAppMessage
* Port more commit tests
* Fix bracket in testAppMessage
* Finish porting commit tests
* Refactor test testAppMessage2
* Port proposal tests
* Refactor test testLocalToRemote
* Refactor test testLocalToRemoteNonMember
* Refactor test testRemoteToLocal
* Refactor test testRemoteNonMemberToLocal
* Refactor test testRemoteToLocalWrongConversation
* Refactor test testAddUsersDirectly
* Refactor test testRemoveUsersDirectly
* Refactor test testProteusMessage
* Refactor test testAddUsersToProteus
* Generalise return type of awaitMatch and friends
Fix error reporting in assertNoEvent
* Port backend removal test
* Port final test in API/MLS
* Move MLS tests out of the Federation module
* Remove old MLS test framework
* Add CHANGELOG entry
* Fix a test setup in runMLSTest
* Update mls-test-cli
Co-authored-by: Paolo Capriotti <[email protected]>
Co-authored-by: Marko Dimjašević <[email protected]>
