Remove imp dependency and test on python 3.12

[mgyucht]

To enable users to use the databricks-cli library with Python 3.12, we must remove our use of the imp library. This is done in this PR as well as adding 3.12 to unit test coverage to ensure the package can be installed & used with Python 3.12.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
setup.py	0.00% <0.00%> (ø)

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[pietern]

We could also run this on all versions we support to be sure.

[pietern]

@mgyucht We might need to update the runner image to ubuntu-22.04 to make it work.

[jmahlik]

Currently there are only wheels for python 2 on pypi.

https://pypi.org/project/databricks-cli/#files

Can the universal option be added to the setup.py? This will produce a python 2 and 3 compatible wheel.

setup(
...,
options={'bdist_wheel': {'universal': True}},
)

Current -- users get the sdist, which causes setup.py invocation, leading to this issue.

databricks_cli-0.17.8-py2-none-any.whl
databricks-cli-0.17.9.dev0.tar.gz

With universal - python 2 and 3 users get a wheel which is faster to install and doesn't invoke the setup.py.

databricks_cli-0.17.9.dev0-py2.py3-none-any.whl
databricks-cli-0.17.9.dev0.tar.gz

Also related to #631.

[mgyucht]

@jmahlik Yes, we've discussed and will do that in a follow-up PR.