Response headers support

[p1c2u]

Backward incompatible changes:

• headers attribute added to OpenAPIResponse datatype

[codecov]

Codecov Report

Merging #332 (a78c242) into master (c4fab4c) will decrease coverage by 0.68%.
The diff coverage is 98.36%.

@@            Coverage Diff             @@
##           master     #332      +/-   ##
==========================================
- Coverage   96.38%   95.69%   -0.69%     
==========================================
  Files          80       80              
  Lines        1577     1650      +73     
==========================================
+ Hits         1520     1579      +59     
- Misses         57       71      +14     

Impacted Files	Coverage Δ
openapi_core/exceptions.py	86.53% <85.71%> (-0.31%)	⬇️
...api_core/deserializing/parameters/deserializers.py	100.00% <100.00%> (ø)
openapi_core/schema/parameters.py	100.00% <100.00%> (ø)
openapi_core/testing/responses.py	100.00% <100.00%> (ø)
openapi_core/validation/request/validators.py	89.22% <100.00%> (-7.49%)	⬇️
openapi_core/validation/response/datatypes.py	100.00% <100.00%> (ø)
openapi_core/validation/response/validators.py	96.22% <100.00%> (+1.22%)	⬆️
openapi_core/validation/validators.py	98.50% <100.00%> (+1.07%)	⬆️

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