feat(ui): Extract StreamMediaAttachmentBuilder widget

[Mounix99]

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Changes requested in issue

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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

[kanat]

LGTM

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1d1acdc) 59.16% compared to head (dc201b4) 59.18%.
Report is 7 commits behind head on master.

Files	Patch %	Lines
...ge_input/stream_message_input_attachment_list.dart	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1816      +/-   ##
==========================================
+ Coverage   59.16%   59.18%   +0.01%     
==========================================
  Files         310      310              
  Lines       17804    17809       +5     
==========================================
+ Hits        10534    10540       +6     
+ Misses       7270     7269       -1     

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[Mounix99]

@kanat can you please review it again ?

[Mounix99]

Review and everything else takes too long, If someone from package developers can manage this PR by themselves, please do it! Thank you, in advance!