Http V2 (Part 2): Add req sychroznier and built in resp types

[YunchuWang]

• implement req synchronzer and support built in fastapi resp types
• tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1709e9f) to head (baec5df).

Additional details and impacted files

@@             Coverage Diff             @@
##              dev       #24      +/-   ##
===========================================
+ Coverage   99.42%   100.00%   +0.57%     
===========================================
  Files           8         5       -3     
  Lines         348        95     -253     
  Branches       92         2      -90     
===========================================
- Hits          346        95     -251     
+ Misses          1         0       -1     
+ Partials        1         0       -1     

Flag	Coverage Δ
unittests	100.00% <100.00%> (+0.57%)	⬆️

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