Implement code injection for OpenApi class

[rjambrecic]

We use Pydantic models for function parameters.

To inject some field in the pydantic object we will need following:

• Create new pydantic class which won't have the fields which need to be injected
• inject_params wrapper needs to get dict of params which need to be injected e.g.
  {
  "Pet": {
  "id": 123
  }
  }
• inject_params wrapper returns the function with new pydantic classes