add OpenAPI version support for request/response schema validation

[k1LoW]

Fix #185

Hi,

Support for considering the OpenAPI version in response.ValidateResponseSchema and request.ValidateRequestSchema.

Each function signature contains a breaking change.

In ValidateRequestSchema and ValidateResponseSchema, I think the version should ideally be passed as a parameter via config.Option, but since all other functions were passing the version as an argument, I followed suit.
(For example, the intent of the arguments of helpers.NewCompiledSchemaWithVersion becomes unclear.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.09%. Comparing base (c440fec) to head (26cab0e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #186   +/-   ##
=======================================
  Coverage   97.08%   97.09%           
=======================================
  Files          40       41    +1     
  Lines        4397     4403    +6     
=======================================
+ Hits         4269     4275    +6     
  Misses        128      128           

Flag	Coverage Δ
unittests	97.09% <100.00%> (+<0.01%)	⬆️

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[daveshanley]

looks great! thank you.

[daveshanley]

There are a couple of other PRs in the pipeline that also add some breaking changes, I want to group them all together so we have one big breaking release.