feat(ui): add showFailedIndicator parameter into StreamMessageWidget

[TinhHuynh]

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Description of the pull request

This PR added showFailedIndicator parameter into StreamMessageWidget to toggle displaying the failed message icon.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.20%. Comparing base (91c42a9) to head (b582b65).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...flutter/lib/src/message_widget/message_widget.dart	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1976   +/-   ##
=======================================
  Coverage   60.20%   60.20%           
=======================================
  Files         317      317           
  Lines       18511    18515    +4     
=======================================
+ Hits        11144    11147    +3     
- Misses       7367     7368    +1     

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