Add support for Python 3.10.

[bdice]

Description

This PR adds support for Python 3.10.

This set of changes aligns with the behavior I'd like to see across RAPIDS for the Python version changes described in RAPIDS Support Notice (RSN) 22 and 23. rapidsai/docs#310

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[vyasr]

Should we be waiting to do this in lockstep across all of RAPIDS?

[bdice]

Should we be waiting to do this in lockstep across all of RAPIDS?

Moving in lockstep is my intention as well, this is meant to be a template for how that move should occur across the rest of RAPIDS. There are a few changes that will happen all very quickly (mostly after finishing the GitHub Actions migration but before 23.02 is very far in development): RSNs announce support for Python 3.10 in 23.02, CI images and CI matrix jobs will be updated, and packages will need changes in their code (like setup.py). We don’t want to be in a situation where CI wants to run Python 3.10 jobs but packages cannot be built or installed because of hard limits like python_requires=">=3.8,<3.10", so enabling support for packages (like this PR) should happen first. We also want to avoid a situation we have had for various packages in the past where packages’ claimed version support was misaligned with RSNs / CI (version support in setup.py was not updated when the support matrix updated).

[vyasr]

Sounds good. I'll mark this PR as Do Not Merge for now so that nobody else accidentally merges prematurely, but feel free to remove when you are ready with the other repos.

[bdice]

This PR's original contents were largely superseded by #1184 -- the changes are now trivial so I'll merge this as-is.

[bdice]

/merge

[codecov-commenter]

Codecov Report

Base: 0.00% // Head: 0.00% // No change to project coverage 👍

Coverage data is based on head (a1cc47f) compared to base (7fb45d4).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##           branch-23.02   #1166   +/-   ##
============================================
  Coverage          0.00%   0.00%           
============================================
  Files                 6       6           
  Lines               414     421    +7     
============================================
- Misses              414     421    +7     

Impacted Files	Coverage Δ
python/rmm/__init__.py	0.00% <ø> (ø)
python/rmm/rmm.py	0.00% <0.00%> (ø)

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