Add wss support

[Vovaman]

Client has to support wss protocol.
Extend https://github.com/Vovaman/example_async_websocket when finish this issue.

[Vovaman]

Set to pause. I monitor SSLContext realization in micropython project.

[f321x]

@Vovaman As the non async version now has wss support, would it be possible to port this or is there still something missing?

[Vovaman]

I want to realize full wss functionality, including certificate verification. There is trouble while decode certificate. Waiting for SSLContext realization. Will check it again this week.