Add instructions for using an ADBC driver

[aiguofer]

Preflight Checklist

• I have installed the latest version of Power Query SDK.
• I have checked existing resources, including the common issues and the release notes.
• I have searched for similar issues.

Problem

I've seen mention of the ADBC driver being used for connections like Dremio and Databricks, but there is no documentation around how to use it in a custom connector. I'd love to use the ADBC driver for Arrow Flight SQL (which I assume is what Dremio is using).

Desired Solution

Power Query SDK includes documentation on how to use the new ADBC drivers.

Alternatives and Workarounds

No response

Additional Context

No response

[mattmasson]

We're still evolving the ADBC extensibility APIs and want to reserve the right to make breaking changes. Until we post public documentation, consider the current functions (and any connector implementations you happen to come across) as experimental.

I don't have an ETA at this time.