Added support for HTTP HEAD method for akka-http and http4s

[abrighton]

Also added minimal test cases to show that the "Unknown method" error no longer occurs.

[blast-hardcheese]

I don't know why you're getting these test failures, they look unrelated. I'll take a look

[codecov]

Codecov Report

Base: 84.50% // Head: 83.00% // Decreases project coverage by -1.51% ⚠️

Coverage data is based on head (b4ab96b) compared to base (505a066).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1686      +/-   ##
==========================================
- Coverage   84.50%   83.00%   -1.51%     
==========================================
  Files          95       95              
  Lines        5836     5838       +2     
  Branches      574      583       +9     
==========================================
- Hits         4932     4846      -86     
- Misses        904      992      +88     

Impacted Files	Coverage Δ
...ators/scala/akkaHttp/AkkaHttpServerGenerator.scala	92.36% <100.00%> (+0.02%)	⬆️
...enerators/scala/http4s/Http4sServerGenerator.scala	96.83% <100.00%> (+0.01%)	⬆️
...dev/guardrail/generators/spi/FrameworkLoader.scala	80.95% <0.00%> (-14.29%)	⬇️
...ore/src/main/scala/dev/guardrail/SwaggerUtil.scala	76.80% <0.00%> (-10.83%)	⬇️
...a/dev/guardrail/generators/LanguageParameter.scala	89.36% <0.00%> (-10.64%)	⬇️
...a/dev/guardrail/generators/ProtocolGenerator.scala	89.76% <0.00%> (-8.92%)	⬇️
...ev/guardrail/generators/scala/ScalaGenerator.scala	84.39% <0.00%> (-6.39%)	⬇️
...ain/scala/dev/guardrail/core/extract/package.scala	93.75% <0.00%> (-6.25%)	⬇️
...ev/guardrail/generators/spi/ModuleLoadResult.scala	71.08% <0.00%> (-4.82%)	⬇️
...la/dev/guardrail/generators/SwaggerGenerator.scala	70.76% <0.00%> (-4.62%)	⬇️
... and 6 more

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[blast-hardcheese]

👌 Thank you!