expose client destroy (parse-community#979)

* expose client destroy

* fixed duplicate method

expose client destroy (parse-community#979)

* expose client destroy

* fixed duplicate method

Feature/coroutines support (parse-community#958)

* Add Coroutines suport

Call parse query find as a suspend function
Call login and singup as a suspend function
Call cloud function as a suspend function

* Add coroutines README link at root project

NullSafe getNotification when building push notification (parse-commu…

…nity#889)

Return null result properly for cloud function (parse-community#862)

Add KTX module (parse-community#860)

* Add KTX module

* Add contribution note

* Add a few other extensions related to primative support

Make PointerEncoder public for LiveQuery (parse-community#859)