use pandas

[atravitz]

by using pandas, we can streamline our table writing, and make it easier to adjust formatting in a `--report``-agnostic way.

rdkit already pulls in pandas, so this doesn't add a new dependency.

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/.

[codecov]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.68%. Comparing base (2b79724) to head (66ae505).
Report is 164 commits behind head on main.

Files with missing lines	Patch %	Lines
openfecli/commands/gather.py	88.46%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1244      +/-   ##
==========================================
- Coverage   93.40%   92.68%   -0.72%     
==========================================
  Files         163      141      -22     
  Lines       12206    10791    -1415     
==========================================
- Hits        11401    10002    -1399     
+ Misses        805      789      -16     

Flag	Coverage Δ
fast-tests	92.68% <88.46%> (-0.72%)	⬇️

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[github-actions]

No API break detected ✅

[IAlibay]

As per slack - we gave up on lightweight a loooong time ago (we can clean up later if we want).