Webhooks to support event type association

[alishaz-polymath]

What does this PR do?

• Allows webhooks to be associated with event types as well (alongside users)
• Allows webhook setup for team events
• Componentifies custom template integration for webhooks
• Only admins/owners are allowed to create/modify webhook for a team event

Demo: https://www.loom.com/share/3f011328f44945a08d3dfd09088840b3

Fixes #1579

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

1. Create a new team event
2. Add a new webhook to the team event
3. Make a booking and confirm that the webhook fired the payload to the endpoint

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code and corrected any misspellings
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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[zomars]

Forgot to approve. Thank you!