Starlette support

[p1c2u]

Fixes #424

[codecov]

Codecov Report

Merging #427 (db3e222) into master (1f07fa2) will decrease coverage by 0.26%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #427      +/-   ##
==========================================
- Coverage   92.88%   92.62%   -0.27%     
==========================================
  Files          97      100       +3     
  Lines        2362     2414      +52     
  Branches      297      304       +7     
==========================================
+ Hits         2194     2236      +42     
- Misses        128      134       +6     
- Partials       40       44       +4     

Impacted Files	Coverage Δ
openapi_core/contrib/starlette/requests.py	78.78% <78.78%> (ø)
openapi_core/contrib/starlette/responses.py	85.00% <85.00%> (ø)
openapi_core/contrib/starlette/__init__.py	100.00% <100.00%> (ø)
openapi_core/schema/parameters.py	92.30% <100.00%> (-0.15%)	⬇️
openapi_core/validation/request/datatypes.py	100.00% <100.00%> (ø)
openapi_core/validation/response/protocols.py	76.47% <100.00%> (+0.71%)	⬆️
openapi_core/validation/validators.py	100.00% <100.00%> (ø)

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