Security validation

[p1c2u]

Very basic with API Key and HTTP types support

Fixes #187

[codecov]

Codecov Report

Merging #195 into master will decrease coverage by 0.23%.
The diff coverage is 93.58%.

@@            Coverage Diff             @@
##           master     #195      +/-   ##
==========================================
- Coverage   96.33%   96.09%   -0.24%     
==========================================
  Files         107      114       +7     
  Lines        2044     2177     +133     
==========================================
+ Hits         1969     2092     +123     
- Misses         75       85      +10

Impacted Files	Coverage Δ
openapi_core/schema/security_schemes/models.py	100% <100%> (ø)
openapi_core/security/exceptions.py	100% <100%> (ø)
openapi_core/schema/security_schemes/generators.py	100% <100%> (ø)
...pi_core/schema/security_requirements/generators.py	100% <100%> (ø)
openapi_core/schema/specs/models.py	95.55% <100%> (+0.1%)	⬆️
openapi_core/schema/operations/generators.py	100% <100%> (ø)	⬆️
openapi_core/schema/components/models.py	100% <100%> (ø)	⬆️
openapi_core/schema/components/factories.py	100% <100%> (ø)	⬆️
openapi_core/validation/request/datatypes.py	100% <100%> (ø)	⬆️
openapi_core/schema/specs/factories.py	100% <100%> (ø)	⬆️
... and 15 more

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