feat: add AWS US East 2 (Ohio) and AP South 1 (Mumbai) region support

[peterfoldes]

Summary

Add AWS_US_EAST_2 (aws-us-east-2, Ohio) and AWS_AP_SOUTH_1 (aws-ap-south-1, Mumbai) to the Region enum, bringing the TypeScript SDK to parity with the Python and JDBC SDKs. Bumps version to 0.9.0.

Related Issues

N/A

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Requester Checklist

• I have self-reviewed my own code
• I have added/updated tests that prove my fix/feature works
• I have included visual proof (screenshot, video, or test output) if applicable
• All CI checks are passing
• PR size is S/M, OR I have justified the size and added a walkthrough
• I have updated documentation if needed

Visual Proof

Enum-only change — no runtime behavior to screenshot. Region is passed as a query parameter to the API; no client-side routing involved.

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Reviewer Checklist

• Requester checklist above is complete
• All CI checks are passing
• Tests adequately cover the changes