Add parameters serialisation support

[lezhnev74]

Currently, the package does not support serialization of parameters.

This ticket is to track efforts for adding serialization support to the package.

Docs:

• https://swagger.io/docs/specification/serialization/
• https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.2.md#support-for-x-www-form-urlencoded-request-bodies

Notes:

• application/x-www-form-urlencoded body messages cannot be fully supported without serialization support
• Query string parameter validation of Arrays with style: form and explode: false #38

[scaytrase]

#54 (comment)

just to not loose this comment. we hitting problems with different parameters format