* Fix issue#2619
Prior to this change, websocket connection would not be disconnected
when dataframe type is other frametype. However, in mqtt spec, it
shoud be disconnected.
This change fix this inconsistent behaviour with mqtt 5.0
* Adopt channel architecture and improve the MQTT frame parser
* Update the test cases for emqx_channel, emqx_protocol
- Improve emqx_client to Use the new emqx_frame:parse/2
- Update the ct suites for emqx_channel, emqx_ws_channel
* Fix test case