Support AWS RDS IAM Authentication for PostgreSQL data source

[winebarrel]

What type of PR is this?

• [ ] Refactor
• [x] Feature
• [ ] Bug Fix
• [ ] New Query Runner (Data Source)
• [ ] New Alert Destination
• [ ] Other

Description

Enable AWS RDS IAM authentication with PostgreSQL data source.

How is this tested?

• [ ] Unit tests (pytest, jest)
• [ ] E2E Tests (Cypress)
• [x] Manually
• [ ] N/A

I created a PostgreSQL (Aurora) instance on AWS RDS and confirmed that I can connect to the DB using IAM authentication from Redash in docker compose:

Related Tickets & Documents

N/A

Mobile & Desktop Screenshots/Recordings (if there are UI changes)