declarative: Ability to import declarative schemas directly to local DB, without having to go through migrations

[tolgap]

Is your feature request related to a problem? Please describe.
Now that we're fully locked into the declarative schema building, its somewhat cumbersome having to create the migrations before being able to apply them to your local DB.

Describe the solution you'd like
It would be nice, actually in general, to be able to spin up your local DB by just doing something like supabase db schema declarative reset/up and have your local DB match the schema itself, instead of going through the extra steps of migrations.

Describe alternatives you've considered
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Additional context
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