Utilities to parse through the validated OpenAPI spec

### What happens? Would be great to have some type-safe utilities built in to the library (similar to [readmeio/oas](https://github.com/readmeio/oas)). Examples: ```typescript getPaths(spec) getPath(spec, endpoint, httpMethod) getRequestBody(spec, endpoint, httpMethod) getResponseBody(spec, endpoint, httpMethod) // etc ``` ### What did you expect to happen? Not a bug but have no where else to file ### How can we reproduce the issue? Not a bug but have no where else to file ### Swagger/OpenAPI Example _No response_