feat(llc): add support for polls api

[xsahil03x]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.21978% with 36 lines in your changes missing coverage. Please review.

Project coverage is 60.48%. Comparing base (aacaba6) to head (33c5a75).

Files with missing lines	Patch %	Lines
packages/stream_chat/lib/src/core/models/poll.dart	25.80%	23 Missing ⚠️
...ges/stream_chat/lib/src/core/models/poll_vote.dart	38.88%	11 Missing ⚠️
...s/stream_chat/lib/src/core/models/poll_option.dart	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2040      +/-   ##
==========================================
+ Coverage   60.27%   60.48%   +0.20%     
==========================================
  Files         318      322       +4     
  Lines       18581    18763     +182     
==========================================
+ Hits        11200    11348     +148     
- Misses       7381     7415      +34     

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