Add FAST session version exchange to SEA client

[aakash-saravanan-db]

Description

Add the SEA client-token/session-version contract required for Fast Path explicit sessions:

• Create SEA sessions with execution_mode=FAST and seed session-local state from CreateSessionResponse.session_version.version_id.
• Send the highest observed session version on every execute and fold versions from execute, polling, result, and heartbeat responses.
• Guard updates by session identity and exclude reattached statement IDs so delayed or foreign responses cannot contaminate the current session.
• Validate FAST create responses and best-effort delete a created server session when its initial version is missing.

Thrift behavior is unchanged.

Testing

• mvn -q -DskipTests compile
• mvn -q spotless:check
• mvn -q -pl jdbc-core -Dtest=DatabricksSessionTest,DatabricksSdkClientTest,DatabricksStatementTest,DatabricksResultSetTest test
• Full databricks-jdbc-core local-profile test suite

Additional Notes to the Reviewer

The implementation tracks the maximum version because statement completions may be observed out of order. Live endpoint validation remains pending availability of a Fast Path-capable SEA endpoint.

[aakash-saravanan-db]

Superseded by #1639, which uses the same commit from an upstream repository branch so same-repository CI credentials and check permissions apply.