Remove amici.pandas.*

[dweindl]

Remove rarely used / obsolete functionality.

Closes #3063.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.03%. Comparing base (63f2e78) to head (33ff148).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3064      +/-   ##
==========================================
- Coverage   78.16%   77.03%   -1.13%     
==========================================
  Files         313      313              
  Lines       20656    20656              
  Branches     1500     1499       -1     
==========================================
- Hits        16145    15913     -232     
- Misses       4502     4734     +232     
  Partials        9        9              

Flag	Coverage Δ
cpp	71.11% <ø> (-0.50%)	⬇️
cpp_python	37.25% <ø> (ø)
petab	45.86% <ø> (ø)
petab_sciml	13.82% <ø> (ø)
python	69.73% <ø> (-0.49%)	⬇️
sbmlsuite-jax	?

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see 8 files with indirect coverage changes

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