Revert "Revert "Create a method to generate OAuth tokens (#644)" (#653)"

[hectorcast-db]

This reverts commit 9c5fae7eae1e84cdc8b635541610e7e8114b0615.

Changes

Introduce again the method to generate OAuth tokens, including fixes for impacted auth types

Tests

• [x] make test run locally
• [x] make fmt applied
• [x] relevant integration tests applied

[github-actions[bot]]

This PR breaks backwards compatibility for databrickslabs/ucx downstream. See build logs for more details.

_{Running from downstreams #147}