feat(ui): add StreamSkeletonLoading and StreamSkeletonBox components

[xsahil03x]

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[codecov]

Codecov Report

❌ Patch coverage is 1.88679% with 52 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main-design-system@5a7f44c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...src/components/common/stream_skeleton_loading.dart	0.00%	40 Missing ⚠️
...heme/components/stream_skeleton_loading_theme.dart	9.09%	10 Missing ⚠️
...tream_core_flutter/lib/src/theme/stream_theme.dart	0.00%	1 Missing ⚠️
...flutter/lib/src/theme/stream_theme_extensions.dart	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (1.88%) 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      #79   +/-   ##
=====================================================
  Coverage                      ?   28.47%           
=====================================================
  Files                         ?      137           
  Lines                         ?     4555           
  Branches                      ?        0           
=====================================================
  Hits                          ?     1297           
  Misses                        ?     3258           
  Partials                      ?        0           

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