"Implement connection limit for WebSocket connections"

[ksysoev]

This pull request adds the ability to limit the number of active WebSocket connections in the ConnectionRegistry. It introduces a new method, CanAccept(), which checks if the registry can accept new connections based on the specified connection limit. If the connection limit is reached, a "Connection limit reached" error message is returned. The AddConnection() method has been updated to check the connection limit before adding a new connection. Additionally, a new option, WithConnectionLimit(), has been added to set the maximum number of connections that can be accepted by the ConnectionRegistry.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 89.28571% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 90.63%. Comparing base (51aea57) to head (25bdd6b).

Files	Patch %	Lines
channel/channel.go	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   89.24%   90.63%   +1.39%     
==========================================
  Files          20       20              
  Lines         818      844      +26     
==========================================
+ Hits          730      765      +35     
+ Misses         66       58       -8     
+ Partials       22       21       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.