Config changes for custom scopes support

[Tejas-Kochar]

Summary

• add option for disabling refresh token to be used in U2M.
• sort scopes when config is initialized.
• add getters for scopes that add default scope "all-apis" if scopes is empty.

How is this tested?

• Unit tests for loading scopes from a test .databrickscfg config file
• Unit tests ensuring disable_oauth_refresh_token is set when environment variable DATABRICKS_DISABLE_OAUTH_REFRESH_TOKEN is set.

---

NO_CHANGELOG=true

[github-actions]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger:
go/deco-tests-run/sdk-py

Inputs:

• PR number: 1166
• Commit SHA: 73d24194f88dace2bc027ba2c8daf405725afe10

Checks will be approved automatically on success.

[Tejas-Kochar]

This is probably a breaking change, to avoid making it we will have to also allow for whitespace as a delimiter as runtime oauth already uses that format.