Refactor client api

[fafhrd91]

• Refactor client api
• Add client connection pool

[codecov]

Codecov Report

Attention: 152 lines in your changes are missing coverage. Please review.

Comparison is base (9ce6d8c) 83.09% compared to head (f8c1a5c) 82.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   83.09%   82.46%   -0.64%     
==========================================
  Files          39       41       +2     
  Lines        6538     6905     +367     
==========================================
+ Hits         5433     5694     +261     
- Misses       1105     1211     +106     

Files	Coverage Δ
src/client/client.rs	68.18% <100.00%> (+15.02%)	⬆️
src/stream.rs	72.98% <100.00%> (+0.31%)	⬆️
src/client/mod.rs	0.00% <0.00%> (ø)
src/client/connector.rs	0.00% <0.00%> (ø)
src/client/stream.rs	70.31% <70.31%> (ø)
src/client/pool.rs	60.07% <60.07%> (ø)

... and 3 files with indirect coverage changes

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