feat(api): Billing alerts on usage emails

[scopsy]

What changed? Why was the change needed?

• Adds a new @novu/notifications package to manage workflows
• Added a novu endpoint handler connected to our ORG in prod
• Added controllerDecorators for the framework SDK to support custom decorators for nest applications (solving the nestjs swagger issue)
• Added React email boilerplate.

  Screenshots

https://github.com/novuhq/packages-enterprise/pull/239

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### Related enterprise PR ### Special notes for your reviewer

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commit: 831db04

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LaunchDarkly flag references

:mag: 1 flag added or modified

Name	Key	Aliases found	Info
IS_USAGE_ALERTS_ENABLED	IS_USAGE_ALERTS_ENABLED