Allow to set caption when uploading file and audio files, and allow adding / edit / remove caption on Event with attachment (also works on local echo)

[bmarty]

Content

Allow to set caption when uploading file and audio files, and allow adding / edit / remove media caption on Event (also work on local echo)

Motivation and context

Closes #3859

Screenshots / GIFs

AddEditRemoveCaptionFull.mp4

Tests

• Send file with a caption
• Long click on a media item to see the available options about caption.

Repeat the same actions when in airplane mode. The last state should be sent to the server once the network is back.

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/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• 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

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 93.89671% with 13 lines in your changes missing coverage. Please review.

Project coverage is 82.95%. Comparing base (ee50b50) to head (ae94b44).
Report is 14 commits behind head on develop.

Files with missing lines	Patch %	Lines
...oid/libraries/matrix/test/timeline/FakeTimeline.kt	61.53%	5 Missing ⚠️
...s/impl/messagecomposer/MessageComposerPresenter.kt	77.77%	2 Missing and 2 partials ⚠️
...ine/components/event/TimelineItemAttachmentView.kt	95.16%	1 Missing and 2 partials ⚠️
...ndroid/features/messages/impl/MessagesPresenter.kt	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3902      +/-   ##
===========================================
+ Coverage    82.92%   82.95%   +0.03%     
===========================================
  Files         1785     1786       +1     
  Lines        45178    45224      +46     
  Branches      5331     5338       +7     
===========================================
+ Hits         37464    37517      +53     
+ Misses        5843     5836       -7     
  Partials      1871     1871              

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud