Allow setting the token cache directory via the DATABRICKS_TOKEN_CACHE_DIR env var

[BenPhegan]

Changes

Allow setting the token cache directory without modifying HOME env via the DATABRICKS_TOKEN_CACHE_DIR env var. Previously, there was no way to set the location of the token cache directory, which caused issues when using either multiple DataBricks accounts or Docker environments without a HOME set.

Tests

Unit tests added to verify that the location reflects the env var. Tested both locally and via Docker.

[andrewnester]

Hi @BenPhegan ! Could you please try to resolve the conflict in the PR, I'll take a look one more time and I think we're ready to merge it. Thank you!

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