feat: add auth hooks config

[J0]

What kind of change does this PR introduce?

Add configuration for auth hooks so that developers can test their hooks locally. Key fields for each hook are:

Enabled - true/false
URI - this should be in the form pg-functions://<database>/<schema>/<function-name>

This was tested by locally building the cli go build . and then ../cli/init + ../cli/start. Check that Docker has GOTRUE_HOOK_<HOOK_NAME>_ENABLED

[coveralls]

Pull Request Test Coverage Report for Build 7580861705

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 58.661%

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Totals
Change from base Build 7580485149:	-0.1%
Covered Lines:	6089
Relevant Lines:	10380

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💛 - Coveralls