repairChecker: Yjs is now able to detect incorrect states that happen when messages get lost. When Yjs is in an incorrect state it repairs itself and syncs again

found another bug that only happens in persistent databases (operationAdded changes an operation, so it needs to be retrieved again after calling it)

implemented new extention for awaitOps. It fixes several consistency issues (they were previously hard to detect), and it is also pretty efficient. It still has some debugger statements, so enjoy with care