Adress Python 3.12 pkg_resources change

[josh-ashkinaze]

What is the problem?

• Python 3.12 is no longer bundled with pkg_resources [1], and this creates an import error when getting package resources. The user-side fix is that if you pip install setuptools this fixes the error, so it is tempting to include setuptools as a run-time dependency in requirements.txt. However, pip flags adding setuptools as a dependency to be 'unsafe.'

[1] mu-editor/mu#2485

• The modern alternative to pkg_resources is importlib.resources and this would obviate any import or unsafe issues. But the problem is, that is is Python 3.9+

• So it is likely I either need to bound above 3.9 (and switch to importlib) or below 3.12 (and keep pkg_resources)

What is the solution?

• The robust way to handle this is to have a function like get_package_resources that will try to use pkg_resources but upon import error switch to using importlib. Then, when reading ANES data or the YAML instruction file---the places where we need package data---we just call get_package_resources so it can handle both.

• Add tests to make sure we ca read files both using pkg_resources and mocking an import error to fallback to importlib