Fix Databricks `workspace export_dir` Directory/File name character incompatibility with Windows FS

[stormwindy]

There have been several instances where Windows users could not export their workspaces using CLI on Windows. This is because characters which are valid to be in directory names on Databricks are not necessarily valid on Windows. We should do safe directory name conversions for this.

See #366, #438,

[chrisst]

This repository has been archived.

The legacy databricks/databricks-cli is deprecated and has been fully replaced by the new Databricks CLI at https://github.com/databricks/cli.

We are closing all open issues here as part of archiving this repository. If your issue still affects the new CLI, we'd appreciate you re-opening it at https://github.com/databricks/cli/issues so the team can track and address it there.