Allow Custom Authentication type configuration for DB connection

**Is your feature request related to a problem? Please describe.**
Current databricks connection setup allows only access token, and cannot be changed to configure other type

**Describe the solution you'd like**
to allow authType for databrciks or any other setup, where based on organisation authentication mechanism we can configure it. in this case if I want to confugure OAuth configuration for databricks , there is no way to configure it.

**Describe alternatives you've considered**
No alternative solution, unable to use cubejs as auth mechanism is not supported by my organisation authenticatoin mechanism of Oauth.