docs: move connection param reference to root, link from README

Relocate docs/connection-parameters.md → CONNECTION_PARAMETERS.md at the repo
root and add a README "Configuration" section linking to it, mirroring the
existing Telemetry section's summary+link pattern.

Co-authored-by: Isaac
Signed-off-by: eric-wang-1990 <e.wang@databricks.com>

Author: eric-wang-1990

docs/connection-parameters.md CONNECTION_PARAMETERS.mddocs/connection-parameters.md renamed to CONNECTION_PARAMETERS.md

@@ -51,6 +51,12 @@ client
   });
 ```
 
+## Configuration
+
+See [CONNECTION_PARAMETERS.md](CONNECTION_PARAMETERS.md) for every connection,
+session, and per-statement parameter the driver accepts, and whether each one
+applies to the Thrift backend (default), the SEA backend, or both.
+
 ## Telemetry
 
 The driver emits connection, statement, and CloudFetch metrics plus