test(csharp/src/Drivers): add Spice.ai test target

[sgrebnov]

Add Spice.ai OSS test target for FlightSQL C# interop driver to test compatibility with arrow-rs FlightSQL implementation.

• Interop/FlightSql: add SpiceAI environment type support (test data, example configuration)
• ci: spin up Spice test server using docker compose
• ci: extend integration tests to include FligthSQL C# Interop integration tests. This can be extended to include more tests targets via configuration files similar to ci/configs/flightsql-spiceai.json added in this PR

Example test run: https://github.com/apache/arrow-adbc/actions/runs/15597223474/job/43930217202?pr=2961

Testing against ADBC helped to identify and fix:

• Update FlightSQL GetDbSchemas and GetTables schemas to fully match the protocol arrow-rs#7638

[lidavidm]

Shouldn't we test the driver directly instead of through C#?

[sgrebnov]

@lidavidm - thank you for review!

Shouldn't we test the driver directly instead of through C#?

Good point. The reason the test was added based on the C# interop driver is to cover both:

• general ADBC compatibility (based on internal usage of the Go ADBC driver)
• full support/integration with clients based on the C# interop driver (important)

Looking for recommendations/guidance here, will update as needed.