feat(redshift-driver): Support IAM auth

[ovr]

This PR is based on #10389

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.49%. Comparing base (a57cabe) to head (4a342ef).

Files with missing lines	Patch %	Lines
packages/cubejs-backend-shared/src/env.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10391      +/-   ##
==========================================
- Coverage   57.51%   57.49%   -0.02%     
==========================================
  Files         222      222              
  Lines       17341    17346       +5     
  Branches     3546     3546              
==========================================
  Hits         9973     9973              
- Misses       6833     6838       +5     
  Partials      535      535              

Flag	Coverage Δ
cube-backend	57.49% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.