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feat: hooks round 3 - begin adding the Before and After user created hooks (#2028)

## Hooks Round 3

This PR will contain a series of commits preparing for the
implementation of before & after user created hooks. It takes the
feedback from https://github.com/supabase/auth/pull/2012 into
consideration.

### Summary

Begin adding the Before and After user created hooks:
* update pkg `internal/conf`
[d5f5436](https://github.com/supabase/auth/pull/2028/commits/d5f5436ce)
* add `BeforeUserCreated` and `AfterUserCreated` to `HookConfiguration`
struct
* add test cases for `EmailValidationBlockedMX` to restore 100% test
coverage
* update pkg `internal/hooks/v0hooks`
[bd37fe2](https://github.com/supabase/auth/pull/2028/commits/bd37fe23c)
    * add `BeforeUserCreated` method to `v0hooks.Manager` struct
    * add `AfterUserCreated` method to `v0hooks.Manager` struct
    * add tests to reach 100% coverage
* add pkg `internal/e2e/e2ehooks`
[903e623](https://github.com/supabase/auth/pull/2028/commits/903e623ea)
    * add `HookCall` to record calls to hooks
    * add `Hook` struct to hold `[]*HookCall` for a given hook name
    * add `HookRecorder` to hold one `Hook` object per hook name
* add `Instance` struct to hold the `httptest.Server` and `HookRecorder`
    * add `AfterUserCreated` method to `v0hooks.Manager` struct
    * add tests to reach 100% coverage in all `internal/e2e` packages
* update pkg `internal/hooks/v0hooks`
[829aec6](https://github.com/supabase/auth/pull/2028/commits/829aec6bb)
    * fix struct and json tag to match to match the Metadata type
* update pkg `internal/hooks/v0hooks`
[ca67be0](https://github.com/supabase/auth/pull/2028/commits/ca67be0db)
    * remove `BeforeUserCreated` and `AfterUserCreated` methods
    * add Before & After user created hooks in `InvokeHook`
* update pkg `intern... (continued)