Add the ability to list available Databricks CLI profiles

[smurching]

This is a low-priority / relatively minor ask - right now, I can see available Databricks CLI profiles and understand what workspaces they correspond to by looking at my ~/.databrickscfg file. It'd be nice-to-have to be able to see this mapping through a CLI command instead - for an example from another project, conda info --envs lists available conda environments.