supabase / auth / 15169693367

Pull #2032

github

feat: add before user created hook to pkg api

This commit explores one possible implementation of this hook by:
- Adding a `triggerBeforeUserCreated` to the *API object
- Updating `signupNewUser` to accept an `*http.Request` param
- Updating the following files with param r:
    - anonymous.go
    - external.go
    - invite.go
    - mail.go
    - signup.go
- Calling `triggerBeforeUserCreated` from `signupNewUser`

Pros:
- Very minor change
- Requires minimal testing
- This pattern will be easy to replicate for future hooks as well

Cons:
- Requires calling the hook in a trasaction, something we do today
  but want to move away from over time.

Note:
I've omitted tests from this commit but they have already been
written in a previous pr.

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