Remove optional dependencies from meta.yaml

[hoxbro]

We could see in previous versions of our conda package we didn't package with recommendations as we do in HoloViews.

This also removes the need for the standard optional dependencies group.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.51%. Comparing base (55f71a9) to head (e8542a0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6878      +/-   ##
==========================================
- Coverage   81.52%   81.51%   -0.02%     
==========================================
  Files         319      319              
  Lines       46895    46895              
==========================================
- Hits        38233    38225       -8     
- Misses       8662     8670       +8     

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