feat: support restoring local db from backup

[sweatybridge]

What kind of change does this PR introduce?

feature

What is the new behavior?

1. Download a logical backup from hosted project
2. Restore to a new local database

supabase db start --from-backup db_cluster.backup

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 12626377511

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 9 of 33 (27.27%) changed or added relevant lines in 2 files are covered.
• 5 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 59.501%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/db/start/start.go	8	32	25.0%

Files with Coverage Reduction	New Missed Lines	%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 12618770776:	-0.1%
Covered Lines:	7672
Relevant Lines:	12894

---

💛 - Coveralls

[avallete]

LGTM