[FEATURE]: Support actions: leave, hangUp, setAudioMuted, sendEndpointTextMessage

[tuantvu]

Description

Support all the available API or Intent actions from https://jitsi.github.io/handbook/docs/dev-guide/dev-guide-ios-sdk and https://jitsi.github.io/handbook/docs/dev-guide/dev-guide-android-sdk.

Is the feature supported by Jitsi?
jitsi_meet Flutter plugin is dependent on the Android and iOS SDK from jitsi.org. If those SDKs do not support a feature, we also can not add it.

• Yes
• No

Describe the solution you'd like

Support for those actions exposed as API calls.

Describe alternatives you've considered

Additional context

[rizkitriandani]

I would like to have the setAudioMuted works like onConferenceJoined listerner where when the action is invoked we can add actions on it.