feat(llc): add support for channel.membership

[xsahil03x]

Fixes: #1134

[codecov]

Codecov Report

Merging #1165 (434214e) into develop (8ae6023) will decrease coverage by 0.01%.
The diff coverage is 14.28%.

@@             Coverage Diff             @@
##           develop    #1165      +/-   ##
===========================================
- Coverage    68.10%   68.08%   -0.02%     
===========================================
  Files          229      229              
  Lines        23438    23445       +7     
===========================================
+ Hits         15962    15963       +1     
- Misses        7476     7482       +6     

Impacted Files	Coverage Δ
packages/stream_chat/lib/src/client/channel.dart	62.57% <0.00%> (-0.39%)	⬇️
...lib/src/v4/message_input/stream_message_input.dart	30.48% <ø> (ø)
...stream_chat/lib/src/core/models/channel_state.dart	100.00% <100.00%> (ø)

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