[Feature Request] Add openapi integration

[sansyrox]

Current Behavior

Robyn doesn't generate OpenAPI documentations by default. OpenAPI integration is a highly demanded feature and I am super keen on supporting it.

Desired Behavior

A few good links to have a look at are:

• https://github.com/marshmallow-code/apispec
• https://github.com/tiangolo/fastapi/blob/bcabbf8b37db3fbc020560e94ad2f90e64d1510a/fastapi/openapi/docs.py#L1

A high level way of implementing the feature would require:

• Adding a documentation route(r)
• Make it configurable
• Make it adhere to the passed params --dev/--prod
• Create a class that has OpenAPI pre-requisites (pre-populating-html strings, reponse_parser, etc.)
• Pass it to the threadpool.

[Mr-Sunglasses]

@sansyrox I'm working on this issue 😁, go ahead and assign it to me.

[patrickelectric]

Is there a PR or a draft open for it ?