feat(csharp/src/Drivers/Databricks): add configuration parameters and models for SEA

[jadewang-db]

Summary

This PR implements the foundational configuration and data models for integrating the Databricks Statement
Execution REST API into the ADBC driver. This is the first subtask in a multi-phase effort to support the new
REST-based protocol as an alternative to the existing Thrift/HiveServer2 implementation.

Changes

Configuration Parameters (DatabricksParameters.cs):

• Added 6 new ADBC parameters for Statement Execution API control:
  • Protocol: Select between thrift (default) or rest protocols
  • ResultDisposition: Control result delivery (inline, external_links, or inline_or_external_links)
  • ResultFormat: Choose result format (arrow_stream, json_array, or csv)
  • ResultCompression: Set compression codec (lz4, gzip, or none)
  • WaitTimeout: Configure statement execution wait timeout in seconds (default: 10s)
  • PollingInterval: Set polling interval for async execution in milliseconds (default: 1000ms)
• Added 4 constants classes for protocol types, result dispositions, formats, and compressions
• All parameters follow adbc.databricks.* naming convention

REST API Models (StatementExecution/StatementExecutionModels.cs):

• Created 17 model classes with System.Text.Json serialization attributes:
  • Session management: CreateSessionRequest, CreateSessionResponse
  • Statement execution: ExecuteStatementRequest, ExecuteStatementResponse, GetStatementResponse
  • Status and errors: StatementStatus, StatementError
  • Result data: ResultManifest, ResultChunk, ExternalLink, ResultSchema, ColumnInfo
  • Parameters and data: StatementParameter, StatementResult, ResultData
• Organized in new StatementExecution namespace for clean separation
• Supports both inline and external link result dispositions

Test Coverage:

• StatementExecutionParametersTest.cs: 8 test methods validating parameter constants, naming conventions, and
  default values
• StatementExecutionModelsTest.cs: 15 test methods for JSON serialization/deserialization of all model types
• All 23 new tests passing ✅

[jadewang-db]

this file is duplicate with another PR, will merge and resolve after the other PR merged.

[jadewang-db]

there is a sessions/ path, that you can create session api.

[eric-wang-1990]

there is a sessions/ path, that you can create session api.

Is that a public path? I am not seeing it in the public doc.
Are we going to create a session first? It's better if we can do that, so all the execute statement can share the same session.

[jadewang-db]

there is a sessions/ path, that you can create session api.

Is that a public path? I am not seeing it in the public doc. Are we going to create a session first? It's better if we can do that, so all the execute statement can share the same session.

https://github.com/databricks/databricks-jdbc/blob/main/src/main/java/com/databricks/jdbc/model/client/sqlexec/CreateSessionRequest.java