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.

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NO_CHANGELOG=true

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Inputs:

• PR number: 1166
• Commit SHA: 8d010884172a70043649d1faead1996d98fc2477

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