Add programmatic webhook management to the v2 API

I'm building the Typefully piece for Activepieces (an open-source automation platform) and hit a blocker on triggers: webhooks can only be configured manually via the dashboard. There are no API endpoints to register or unregister webhook URLs programmatically (POST /webhooks, DELETE /webhooks), which means users have to manually copy-paste the webhook URL into the dashboard instead of having it set up automatically.

Requested endpoints:

• POST /social-sets/{id}/webhooks — register a URL + events

• DELETE /social-sets/{id}/webhooks/{id} — unregister on disconnect
  

https://www.activepieces.com/pieces/typefully

https://github.com/activepieces/activepieces/tree/main/packages/pieces/community/typefully