Support OpenAPI webhooks

[MorelSerge]

What problem will this feature address?

OpenAPI supports defining webhooks:

• 3.1: spec & blog
• 2.0 & 3.0: spec

Describe the solution you'd like

Would be great to also parse the webhooks in an OpenAPI spec file, adding their pages too.

Describe alternatives you've considered

N/A

Additional context

No response