Fix composer options bottom sheet position

[jonnyandrew]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Move the composer options / attachments bottom sheet up one level in the UI hierarchy so that it is outside of the composer bottom sheet.

Motivation and context

Fixes an issue where the attachments dialog is displayed in the wrong position and cannot be swiped to dismiss (see screenshots).

The issue isn't presenting as severely when I test on my physical device as when tested in an emulator (screenshots below).

Screenshots / GIFs

Before

Before.webm

After

After.webm

Tests

• Go to composer
• Enter text and ensure keyboard is open
• Open the composer options / attachments menu and dismiss
• Close the keyboard
• Open the composer options / attachments menu and dismiss

Tested devices

• Physical
• Emulator
• OS version(s):

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

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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0 Security Hotspots
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No Coverage information
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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (fc20569) 58.21% compared to head (5840c8c) 58.20%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1469      +/-   ##
===========================================
- Coverage    58.21%   58.20%   -0.01%     
===========================================
  Files         1133     1133              
  Lines        30266    30259       -7     
  Branches      6192     6193       +1     
===========================================
- Hits         17619    17613       -6     
  Misses       10008    10008              
+ Partials      2639     2638       -1     

Files	Coverage Δ
...ent/android/features/messages/impl/MessagesView.kt	59.34% <100.00%> (+0.57%)	⬆️
...ssages/impl/messagecomposer/MessageComposerView.kt	63.15% <92.30%> (-1.43%)	⬇️

... and 1 file with indirect coverage changes

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