mlx - add argpartition to numpy

[lkarthee]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (mlx@ad948c2). Click here to learn what that means.

Files	Patch %	Lines
keras/src/backend/mlx/numpy.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             mlx   #19680   +/-   ##
======================================
  Coverage       ?   75.54%           
======================================
  Files          ?      508           
  Lines          ?    47225           
  Branches       ?     8686           
======================================
  Hits           ?    35675           
  Misses         ?     9808           
  Partials       ?     1742           

Flag	Coverage Δ
keras	75.39% <0.00%> (?)
keras-jax	59.76% <0.00%> (?)
keras-numpy	54.31% <0.00%> (?)
keras-tensorflow	61.07% <0.00%> (?)
keras-torch	59.78% <0.00%> (?)

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[fchollet]

LGTM!