[MAINT]: Generate SDK from OpenAPI types

[JamieMagee]

Describe the need

As of release v2.1.0^1 of the GitHub REST API description webhook schemas are included. Currently Octokit.Webhooks is manually maintained, but it would be easier to keep in sync if this package's types were generated from the schema.

Related issues:

• https://github.com/octokit/octokit.net/discussions/2527
• https://github.com/octokit/webhooks/issues/470

SDK Version

No response

API Version

No response

Relevant log output

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[JamieMagee]

Related https://github.com/microsoft/kiota/issues/3914