Refactor composer UI components to separate files

[jonnyandrew]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

• Extract UI components from TextComposer.kt into separate files.
• No code changes except new previews.

Motivation and context

• To reduce tech debt introduced by: [Rich text editor] Add full screen mode #1447
• To prepare for voice message UI: [Story] Record and send a voice message element-meta#2084

Screenshots / GIFs

N/A

Tests

N/A

Tested devices

• Physical
• Emulator
• OS version(s): N/A

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-x-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-x-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

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Attention: 66 lines in your changes are missing coverage. Please review.

Comparison is base (daf46d7) 58.70% compared to head (b58b359) 58.69%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1506      +/-   ##
===========================================
- Coverage    58.70%   58.69%   -0.02%     
===========================================
  Files         1133     1137       +4     
  Lines        30300    30308       +8     
  Branches      6215     6223       +8     
===========================================
  Hits         17789    17789              
- Misses        9840     9843       +3     
- Partials      2671     2676       +5     

Files	Coverage Δ
...ent/android/libraries/textcomposer/TextComposer.kt	81.45% <ø> (+7.04%)	⬆️
...s/textcomposer/components/ComposerOptionsButton.kt	33.33% <33.33%> (ø)
...composer/components/DismissTextFormattingButton.kt	33.33% <33.33%> (ø)
...id/libraries/textcomposer/components/SendButton.kt	81.08% <81.08%> (ø)
...ibraries/textcomposer/components/TextFormatting.kt	54.80% <54.80%> (ø)

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[bmarty]

LGTM, thanks!