feat: add server-sent events client #658

[jeevatkm]

Closes #658

[codecov]

Codecov Report

Attention: Patch coverage is 98.74608% with 4 lines in your changes missing coverage. Please review.

Project coverage is 99.80%. Comparing base (8422694) to head (7e995ae).
Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
sse.go	98.73%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3     #931      +/-   ##
==========================================
- Coverage   99.91%   99.80%   -0.11%     
==========================================
  Files          15       16       +1     
  Lines        3340     3658     +318     
==========================================
+ Hits         3337     3651     +314     
- Misses          2        5       +3     
- Partials        1        2       +1     

Flag	Coverage Δ
unittests	99.80% <98.74%> (-0.11%)	⬇️

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