AWS API Gateway with Amazon Lambda integrations support

[p1c2u]

PathFinder refactor and path_finder_cls parameter added to Validator to introduce APIGatewayPathFinder

Fixes #204

[codecov]

Codecov Report

Merging #545 (560e8f8) into master (f6dd268) will decrease coverage by 4.16%.
The diff coverage is 41.83%.

❗ Current head 560e8f8 differs from pull request most recent head dcd14cb. Consider uploading reports for the commit dcd14cb to get more accurate results

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
- Coverage   90.30%   86.14%   -4.16%     
==========================================
  Files         124      134      +10     
  Lines        3681     3942     +261     
  Branches      442      480      +38     
==========================================
+ Hits         3324     3396      +72     
- Misses        302      485     +183     
- Partials       55       61       +6     

Impacted Files	Coverage Δ
openapi_core/contrib/aws/__init__.py	0.00% <0.00%> (ø)
openapi_core/contrib/aws/datatypes.py	0.00% <0.00%> (ø)
openapi_core/contrib/aws/finders.py	0.00% <0.00%> (ø)
openapi_core/contrib/aws/requests.py	0.00% <0.00%> (ø)
openapi_core/contrib/aws/responses.py	0.00% <0.00%> (ø)
openapi_core/contrib/aws/types.py	0.00% <0.00%> (ø)
openapi_core/validation/validators.py	93.04% <83.33%> (-1.51%)	⬇️
openapi_core/templating/paths/iterators.py	86.81% <86.81%> (ø)
openapi_core/templating/paths/protocols.py	87.50% <87.50%> (ø)
openapi_core/templating/paths/__init__.py	100.00% <100.00%> (ø)
... and 5 more

... and 1 file with indirect coverage changes

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[p1c2u]

Closing in favor of #796