fix: compare MediaType with wildcards

[adrienyhuel]

When checking for a matching response in OpenAPI with ContentType from responss body, match OpenAPI spec wildcards

New "extractContentType" function copied and adapted from the same function in requests/validate_body.go

Closes #316

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.27%. Comparing base (f309f59) to head (1d43d03).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #318   +/-   ##
=======================================
  Coverage   98.27%   98.27%           
=======================================
  Files          75       75           
  Lines        9192     9205   +13     
=======================================
+ Hits         9033     9046   +13     
  Misses        132      132           
  Partials       27       27           

Flag	Coverage Δ
unittests	98.27% <100.00%> (+<0.01%)	⬆️

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