Implement keepalive

[Gsantomaggio]

fixes #25

[codecov-commenter]

Codecov Report

Merging #54 (351b024) into main (cef86aa) will decrease coverage by 0.26%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   74.57%   74.30%   -0.27%     
==========================================
  Files          15       15              
  Lines        1644     1658      +14     
==========================================
+ Hits         1226     1232       +6     
- Misses        331      341      +10     
+ Partials       87       85       -2     

Impacted Files	Coverage Δ
pkg/stream/server_frame.go	66.01% <0.00%> (-0.52%)	⬇️
pkg/stream/client.go	75.37% <16.66%> (-1.31%)	⬇️
pkg/stream/socket.go	78.57% <0.00%> (+7.14%)	⬆️

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