[PTT] Start Element Call widget in its own task

[jonnyandrew]

Note the target branch is the push-to-talk POC (feature/ons/ptt_bluetooth)

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Start Element Call widget in it's own task.

Motivation and context

• So that the push-to-talk call POC can continue running either in the background or in picture-in-picture mode while sending messages to the room.
• So that pressing back from the home screen does not end the ongoing call or bluetooth connection.

Screenshots / GIFs

N/A

Tests

• Start a push-to-talk call (see Bluetooth-assisted Push to Talk (PTT) via Element Call #6464)
• Put the call into PiP or background
• Go to recent apps
• Note there are two separate tasks: one for the room and one for the call
• Navigate to the room task
• Press back until you see the home screen
• Note the call is still running (given the Activity has not been destroyed by the OS)

Tested devices

• Physical
• Emulator
• OS version(s): Android 13, Android 11

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[sonarqubecloud]

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