Add Databricks driver

[fjakobs]

Databricks Driver for SQLTools published to Marketplace at https://marketplace.visualstudio.com/items?itemName=databricks.sqltools-databricks-driver

This PR updates the document and adds Databricks driver as a community driver.

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[gjsjohnmurray]

@fjakobs thanks for this PR. I'll be happy to approve and merge it as soon as you say it's no longer Draft.

[fjakobs]

Thanks @gjsjohnmurray. I'll just waiting for the driver to hit the marketplace. Will update the PR once it's there.

[fjakobs]

I've pushed the Databricks driver to the VSCode marketplace. The PR can be merged.

https://marketplace.visualstudio.com/items?itemName=databricks.sqltools-databricks-driver&ssr=false#overview