feat(llc): mark unread feature - core

[Brazol]

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

Description of the pull request

core functionality of marking messages in channels as unread

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 15.38462% with 44 lines in your changes are missing coverage. Please review.

Project coverage is 59.28%. Comparing base (6e58645) to head (2c27ad0).

Files	Patch %	Lines
packages/stream_chat/lib/src/client/channel.dart	14.70%	29 Missing :warning:
...ackages/stream_chat/lib/src/core/models/event.dart	0.00%	7 Missing :warning:
...ages/stream_chat/lib/src/core/api/channel_api.dart	0.00%	5 Missing :warning:
packages/stream_chat/lib/src/client/client.dart	0.00%	2 Missing :warning:
packages/stream_chat/lib/src/core/models/read.dart	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1880      +/-   ##
==========================================
- Coverage   59.41%   59.28%   -0.13%     
==========================================
  Files         310      310              
  Lines       17837    17889      +52     
==========================================
+ Hits        10597    10605       +8     
- Misses       7240     7284      +44     

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