feat(ui): message composer structure

[renefloor]

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This adds the structure for the message composer

Screenshots / Videos

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/message-composer-structure

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[codecov]

Codecov Report

❌ Patch coverage is 12.66667% with 131 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main-design-system@983218e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../components/message_composer/message_composer.dart	0.00%	46 Missing ⚠️
...nents/message_composer/message_composer_input.dart	0.00%	31 Missing ⚠️
...sage_composer/message_composer_input_trailing.dart	0.00%	28 Missing ⚠️
...chment/message_composer_attachment_media_file.dart	0.00%	15 Missing ⚠️
...er/lib/src/components/controls/remove_control.dart	0.00%	10 Missing ⚠️
...tter/lib/src/components/buttons/stream_button.dart	95.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (12.66%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             main-design-system      #42   +/-   ##
=====================================================
  Coverage                      ?   35.64%           
=====================================================
  Files                         ?       83           
  Lines                         ?     2194           
  Branches                      ?        0           
=====================================================
  Hits                          ?      782           
  Misses                        ?     1412           
  Partials                      ?        0           

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