Webhook Functionality

What does this MR do and why?

___Describe in detail what your merge request does and why.___

Add Webhooks to Crafty that can fire in response to different events.

Implements #72 (closed)

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MR acceptance checklist

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• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
• Have you applied correct labels?