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

[github-actions]

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Inputs:

• PR number: 1166
• Commit SHA: e9d4523a1aa321e61fac872ecf453fdc0adb649e

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