replaced pkg_resources with importlib.resources

[michaelraczycki]

Description

Replacement of deprecated pkg_resources, now arviz will use importlib.resources
which will allow to use more strict testing policy in packages importing arviz ( previously because of pkg_resources
failing test on warning was not possible, because each import of arviz was warning about deprecation of pkg_resources)

---

📚 Documentation preview 📚: https://arviz--2232.org.readthedocs.build/en/2232/

[OriolAbril]

It looks like the part about the static files is not working after these updates and ArviZ can't be imported, failing all tests. Are you able to import locally after your changes?

[ahartikainen]

I think python3 actually reads bytes when calling pkg_resources resource_string

Edit. Oh read_text is fine, but maybe we need to change how we read it

[ahartikainen]

Suggested change

	return [importlib.resources.read_text("arviz", fname) for fname in STATIC_FILES]
	return [importlib.resources.files("arviz").joinpath(fname).read_text() for fname in STATIC_FILES]

edit. read_text is fine just change how it reads it.

[ahartikainen]

Ok, it fails because files API came in 3.9.

@OriolAbril when are we going to ditch 3.8 support?

[OriolAbril]

We could do it now : https://scientific-python.org/specs/spec-0000/. It'd be best to check dependencies with the spec on a different PR then rebase. Any takers?

[michaelraczycki]

I could do it (probably closer to the weekend as now I want to finish the ModelBuilder PR on pymc-experimental)
So what's needed is to create another branch, then change the python version to 3.9 in setup.py and push it to see if the CI can correctly build and install it?

[OriolAbril]

Already in progress at #2233 @michaelraczycki. It looks like we'll have to wait a bit though.

[michaelraczycki]

Already in progress at #2232 @michaelraczycki. It looks like we'll have to wait a bit though.

I think you've linked this issue :)

[OriolAbril]

Fixed, sorry

[OriolAbril]

I closed the PR accidentally, reopening again seems to create a new one. @michaelraczycki can you re-open it? (either here or from main...michaelraczycki:arviz:pkg_resources_replacement) it should already be rebased and passing all checks

[OriolAbril]

Ping @michaelraczycki