CI/CD: Cache C client build

[juliannguyen4]

Build C client in a separate job, then save shared library as Github artifact Then pass artifact to job that builds Python client

[codecov-commenter]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 82.37%. Comparing base (34c2e3f) to head (d400d49). :warning: Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #764      +/-   ##
==========================================
+ Coverage   82.35%   82.37%   +0.02%     
==========================================
  Files          99       99              
  Lines       14379    14509     +130     
==========================================
+ Hits        11842    11952     +110     
- Misses       2537     2557      +20     

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