New App Layout: Adds New Chat Bottom Sheet

[ericdecanini]

Type of change

• [x] Feature
• [ ] Bugfix
• [ ] Technical
• [ ] Other :

Content

Motivation and context

Closes https://github.com/vector-im/element-android/issues/6717

This is the new way we differentiate between a new DM or a new create room chat when using the FAB on the main screen

Screenshots / GIFs

Tests

• Enable the New App Layout Feature Flag
• Click the primary FAB
• See bottom sheet
• Ensure both options work

Tested devices

• [x] Physical
• [ ] Emulator
• OS version(s): Android 12

Checklist

• [ ] Changes has been tested on an Android device or Android emulator with API 21
• [x] 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
• [x] Pull request is based on the develop branch
• [x] 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
• [x] 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()

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