feat: add buckets & objects grants for postgres

[soedirgo]

In this change, the grant is actually performed for supabase_storage_admin because DB_SUPER_USER is not postgres. We add another migration to perform the grant for postgres.

[coveralls]

Pull Request Test Coverage Report for Build 19494435849

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.009%) to 75.914%

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Files with Coverage Reduction	New Missed Lines	%
src/internal/database/tenant.ts	2	83.65%

Totals
Change from base Build 19426789519:	-0.009%
Covered Lines:	25387
Relevant Lines:	33165

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💛 - Coveralls