feat: Add open API parser

[erezrokah]

Example https://www.npmjs.com/package/@readme/openapi-parser

Similar to the Python SDK

We can also use this to understand which types to support

[disq]

Looks like python SDK is not really "parsing" the api but just reading the definitions from the OpenAPI spec. Will try to do the same here, without the extra package.

[disq]

Done in #25