fix(persistence): improve pagination handling by clamping offset

[xsahil03x]

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Github Issue: #2034

Description of the pull request

This PR fixes a case in persistence.getChannelStates method where the pagination.offset can be greater than the channelStates.length which results in an exception. The fix now clamps the offset before applying it to the channelStates.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 63.17%. Comparing base (1645c7b) to head (8113449).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...stence/lib/src/stream_chat_persistence_client.dart	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2247   +/-   ##
=======================================
  Coverage   63.17%   63.17%           
=======================================
  Files         402      402           
  Lines       25228    25228           
=======================================
+ Hits        15937    15939    +2     
+ Misses       9291     9289    -2     

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