WIP: S3 improvements

[cirospaciari]

Changes:

• Add .delete alias to unlink
• Fix region detection
• Add test for region and endpoint detection
• Re-add static methods on Bucket
• Reorganize S3 Client code
• Improve download stream reliability
• Add download stream reliability tests

What does this PR do?

• Documentation or TypeScript types (it's okay to leave the rest blank in this case)
• Code changes

How did you verify your code works?

Tests

[robobun]

^{Updated 1:53 PM PT - Jan 4th, 2025}

❌ @cirospaciari, your commit f5a7f0a has 1 failures in #8990:

• test/js/bun/http/serve-body-leak.test.ts - timeout on 🪟 2019 x64
• test/js/bun/http/serve-body-leak.test.ts - timeout on 🪟 2019 x64-baseline

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🧪   try this PR locally:

bunx bun-pr 16167