Add OpenAPI spec of endpoints to our docs

[jzone3]

Will keep them updated https://mintlify.com/docs/api-playground/openapi

[Jped]

@abubakarsohail arent we doing this?

[abubakarsohail]

@abubakarsohail arent we doing this?

We are using the spec for some of the endpoints and not all of them. Also, the spec is not actively maintained.