adding rich as a dependency

[atravitz]

Right now rich gets pulled in by other dependencies (openff-nagl-base and perses), but we should require it specifically.

Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[github-actions]

No API break detected ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.73%. Comparing base (9296aa7) to head (3f7c9df).
⚠️ Report is 257 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1256      +/-   ##
==========================================
- Coverage   94.34%   92.73%   -1.61%     
==========================================
  Files         141      141              
  Lines       10853    10853              
==========================================
- Hits        10239    10065     -174     
- Misses        614      788     +174     

Flag	Coverage Δ
fast-tests	92.73% <ø> (?)
slow-tests	?

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