Add elixir coverage

[albertored]

Fixes #185

We need to wait for covertool/covertool#72 to be merged

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.73% 🎉

Comparison is base (9bbe0b5) 72.26% compared to head (48253c8) 73.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
+ Coverage   72.26%   73.00%   +0.73%     
==========================================
  Files          60       60              
  Lines        1904     1904              
==========================================
+ Hits         1376     1390      +14     
+ Misses        528      514      -14     

Flag	Coverage Δ
api	70.16% <ø> (+2.09%)	⬆️
elixir	37.57% <ø> (+19.25%)	⬆️
erlang	73.58% <ø> (ø)
exporter	66.80% <ø> (ø)
sdk	78.13% <ø> (ø)
zipkin	54.16% <ø> (ø)

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see 4 files with indirect coverage changes

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[tsloughter]

Looking good. Technically I can merge in the covertool repo but will wait to see if anyone else wants to review :)

[albertored]

@tsloughter I don't think anybody will merge the PR on covertool 😅