feat: Add TCP keepalive configuration for Redshift connections [DRAFT]

[luis-garza-dev]

Add support for configuring TCP keepalive settings in Redshift connections to help prevent connection timeouts in long-running queries. This change:

• Adds TCP keepalive configuration options to RedshiftCredentials
• Sets sensible defaults (enabled, idle=60s, interval=30s, count=5)
• Passes keepalive settings through to the connection method

Default values align with common TCP keepalive configurations and should work well for most use cases while preventing idle connection drops.

TODO

• [ ] Finalize redshift-connector version once keepalive changes are merged
• [ ] Add documentation for new configuration options
• [ ] Add tests for keepalive settings

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