Ws backend

[ksysoev]

Adds implementation for WS backend and implements code example with pass-through ws messages to backend ws server.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 81.25000% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 88.76%. Comparing base (0f243f5) to head (b444a85).

Files	Patch %	Lines
backend/ws.go	81.25%	8 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   89.52%   88.76%   -0.77%     
==========================================
  Files          17       18       +1     
  Lines         630      694      +64     
==========================================
+ Hits          564      616      +52     
- Misses         51       59       +8     
- Partials       15       19       +4     

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