feat(call): Active call timeline rendering

[BillCarsonFr]

Content

Fixes #6749

Draft because depends of rust sdk changes matrix-org/matrix-rust-sdk#6668

Motivation and context

Render the members currently in the active call in the timeline

Screenshots / GIFs

Tests

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Tested devices

• Physical
• Emulator
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Checklist

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• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
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• Pull request includes screenshots or videos if containing UI changes
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