feat(csharp/src/Drivers/Apache/Spark): Add support for username and password authentication

### What feature or improvement would you like to see?

Add support for username and password authentication

This is in addition to the the `token`-based authentication.

Other connection properties may also be necessary:
`adbc.spark.scheme` - the scheme of the connection { `http` | `https` }
`adbc.spark.auth_type` - to indicate with authentication type to use. { `basic` | `token` }