Add testing for py3.10

[daico007]

PR Summary:

Mirror this mosdef-hub/mbuild#1110. Add testing/supports for python 3.10 and 3.11.

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

Merging #536 (964c7b5) into main (64e4944) will increase coverage by 0.03%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #536      +/-   ##
==========================================
+ Coverage   69.18%   69.21%   +0.03%     
==========================================
  Files          16       16              
  Lines        1671     1673       +2     
==========================================
+ Hits         1156     1158       +2     
  Misses        515      515              

[daico007]

Note: it seems like we can only extend to support/test for python 3.10, currently limited by openff-toolkit.