Make custom_capture_audio as a standard flutter plugin

[littleGnAl]

Make custom_capture_audio standalone, to demonstrate how to implement RtcEnginePlugin as a standard flutter plugin

[littleGnAl]

see https://github.com/AgoraIO/Agora-Flutter-SDK/issues/615 also

[vakrolme]

@littleGnAl, the 6.0.0 branch doesn't support the old interface of RtcEnginePluginRegistrant.register(customCaptureVideoPlugin).

Could you please tell me how to port an existing plugin from 5.x.x to 6.x.x?

[littleGnAl]

@vakrolme Can you raise a new issue for your question?

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