Add rich content listener to markdown text input

[surakin]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Fixes #2917
Added rich content listener to the markdown text input

Motivation and context

Screenshots / GIFs

Tests

• Go to a room
• Select a GIF using your android keyboard
• See how it gets sent

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 includes a new file under ./changelog.d. See https://github.com/element-hq/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

[github-actions]

Thank you for your contribution! Here are a few things to check in the PR to ensure it's reviewed as quickly as possible:

• Your branch should be based on origin/develop, at least when it was created.
• There is a changelog entry in the changelog.d folder with the Towncrier format.
• The test pass locally running ./gradlew test.
• The code quality check suite pass locally running ./gradlew runQualityChecks.
• If you modified anything related to the UI, including previews, you'll have to run the Record screenshots GH action in your forked repo: that will generate compatible new screenshots. However, given Github Actions limitations, it will prevent the CI from running temporarily, until you upload a new commit after that one. To do so, just pull the latest changes and push an empty commit.

[codecov]

Codecov Report

Attention: Patch coverage is 47.05882% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 75.23%. Comparing base (544d064) to head (2243832).

Files	Patch %	Lines
...tcomposer/components/markdown/MarkdownTextInput.kt	43.75%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2918      +/-   ##
===========================================
- Coverage    75.25%   75.23%   -0.02%     
===========================================
  Files         1550     1550              
  Lines        36966    36983      +17     
  Branches      7156     7160       +4     
===========================================
+ Hits         27817    27825       +8     
- Misses        5412     5421       +9     
  Partials      3737     3737              

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[surakin]

I'm not really convinced copying UriContentListener is the best approach 🤔

[jmartinesp]

Thanks, it works like a charm!

[jmartinesp]

Maybe we should provide this to the RTE and not the other way around. I'll keep it in mind.