Add the pampa colormap

[apcamargo]

This PR adds the Pampa colormap, a magenta→teal diverging colormap constructed by interpolating colors in the Msh color space, which creates a smooth midpoint transition and reduces banding.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.54%. Comparing base (16e45c5) to head (f4c15da).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   95.54%   95.54%           
=======================================
  Files         167      167           
  Lines        2176     2177    +1     
=======================================
+ Hits         2079     2080    +1     
  Misses         97       97           

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