Object caster

[p1c2u]

Suport for primitive properties casting of urlencoded objects.

Fixes #700

Related to #698

[codecov]

Codecov Report

Merging #701 (3417569) into master (efaa5ac) will increase coverage by 0.07%.
The diff coverage is 89.78%.

@@            Coverage Diff             @@
##           master     #701      +/-   ##
==========================================
+ Coverage   90.94%   91.01%   +0.07%     
==========================================
  Files         127      127              
  Lines        3855     3986     +131     
  Branches      475      488      +13     
==========================================
+ Hits         3506     3628     +122     
- Misses        289      294       +5     
- Partials       60       64       +4     

Files	Coverage Δ
openapi_core/casting/schemas/__init__.py	100.00% <100.00%> (ø)
openapi_core/casting/schemas/factories.py	100.00% <100.00%> (ø)
...penapi_core/unmarshalling/request/unmarshallers.py	81.72% <ø> (+2.04%)	⬆️
openapi_core/unmarshalling/unmarshallers.py	85.36% <ø> (-0.35%)	⬇️
openapi_core/validation/request/validators.py	88.13% <100.00%> (+0.54%)	⬆️
openapi_core/validation/response/validators.py	81.13% <100.00%> (+1.03%)	⬆️
openapi_core/validation/validators.py	94.28% <71.42%> (-1.37%)	⬇️
openapi_core/contrib/falcon/requests.py	84.61% <54.54%> (-8.25%)	⬇️
openapi_core/casting/schemas/casters.py	89.84% <89.28%> (-3.49%)	⬇️

... and 2 files with indirect coverage changes