make discretization backend agnostic

[divyashreepathihalli]

No description provided.

[codecov]

Codecov Report

Patch coverage: 80.76% and project coverage change: -12.93% ⚠️

Comparison is base (1704ecf) 79.75% compared to head (fa12ff5) 66.83%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #896       +/-   ##
===========================================
- Coverage   79.75%   66.83%   -12.93%     
===========================================
  Files         318      318               
  Lines       28638    28653       +15     
  Branches     5451     5456        +5     
===========================================
- Hits        22841    19149     -3692     
- Misses       4333     8163     +3830     
+ Partials     1464     1341      -123     

Flag	Coverage Δ
keras_core	66.83% <80.76%> (-12.86%)	⬇️
keras_core-numpy	?
keras_core-tensorflow	66.83% <80.76%> (+<0.01%)	⬆️
keras_core-torch	?

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Files Changed	Coverage Δ
keras_core/backend/common/backend_utils.py	65.71% <73.68%> (-34.29%)	⬇️
keras_core/layers/preprocessing/discretization.py	81.48% <100.00%> (-1.56%)	⬇️

... and 75 files with indirect coverage changes

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[fchollet]

Thanks for the PR! Some initial comments.