fix(addMessage-moveMessage-async-await): Rewrite addMessage, moveMessage to async/await ZMS-187 (#779)

* rewrite add message to async/await

* rewrite move message, add moveAsync, use async/await

* message-handler refactoring + optimizations

* message-handler update comment

* remove non-async version of getThreadId

* fix initial userData fetch, add check for empty userData

* finishfunc should not be called with err, updateAddressRegister never throws

* fix typo

* return finishFunc() in addAsync at the end

* message-handler addEntries callback should not be async

* fix processaudits then,catch resolve call

* fix comment

* remove processNext, make code a bit more readable. Refactor

* update comment

* add better comment

* fix race condition

* updateMessage remove await when returning done()

* message-handler move message refactoring. Move done and updateMessage functions outside

Author: NickOvt