feat: add redshift driver

[brianheineman]

Related SQLx fix for Redshift support: https://github.com/launchbadge/sqlx/pull/2832

[github-actions[bot]]

Bencher Report

Branch	add-redshift-driver
Testbed	localhost

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• Latency

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Benchmark	Latency	nanoseconds (ns)
postgres-embedded	📈 view plot ⚠️ NO THRESHOLD	798,410,000.00
postgresql-embedded	📈 view plot ⚠️ NO THRESHOLD	817,550,000.00
rusqlite	📈 view plot ⚠️ NO THRESHOLD	4,450,000.00
sqlite	📈 view plot ⚠️ NO THRESHOLD	4,825,400.00

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.95%. Comparing base (243d709) to head (8bc6cfd). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #199 +/- ## ========================================== + Coverage 93.92% 93.95% +0.02% ========================================== Files 93 94 +1 Lines 11716 11756 +40 ========================================== + Hits 11004 11045 +41 + Misses 712 711 -1 ```

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