Implements graceful shutdown

[ksysoev]

Implements graceful shutdown for components to address issue #4

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.94118% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 87.56%. Comparing base (c1bd247) to head (d11d48d).

Files	Patch %	Lines
server/server.go	68.42%	9 Missing and 3 partials ⚠️
channel/connection_registry.go	89.28%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   88.91%   87.56%   -1.35%     
==========================================
  Files          17       17              
  Lines         496      563      +67     
==========================================
+ Hits          441      493      +52     
- Misses         44       55      +11     
- Partials       11       15       +4     

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