Implement streamable https

[leehack]

Close #16

[codecov]

Codecov Report

Attention: Patch coverage is 30.86420% with 336 lines in your changes missing coverage. Please review.

Project coverage is 18.89%. Comparing base (74de327) to head (2faa967).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/server/streamable_https.dart	9.41%	231 Missing ⚠️
lib/src/client/streamable_https.dart	52.91%	105 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   16.35%   18.89%   +2.54%     
==========================================
  Files          11       14       +3     
  Lines        2397     2879     +482     
==========================================
+ Hits          392      544     +152     
- Misses       2005     2335     +330     

Flag	Coverage Δ
unittests	18.89% <30.86%> (+2.54%)	⬆️

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