adding ifft2 method to ops

[rohithpudari]

Added implementation of ifft2 to ops.

fixes #20437

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.77778% with 10 lines in your changes missing coverage. Please review.

Project coverage is 82.01%. Comparing base (c052cea) to head (98b704c).
Report is 24 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/ops/math.py	62.50%	5 Missing and 4 partials ⚠️
keras/api/_tf_keras/keras/ops/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20447      +/-   ##
==========================================
- Coverage   82.01%   82.01%   -0.01%     
==========================================
  Files         514      514              
  Lines       47194    47239      +45     
  Branches     7408     7413       +5     
==========================================
+ Hits        38706    38741      +35     
- Misses       6698     6704       +6     
- Partials     1790     1794       +4     

Flag	Coverage Δ
keras	81.86% <77.77%> (-0.01%)	⬇️
keras-jax	64.91% <48.88%> (-0.02%)	⬇️
keras-numpy	59.86% <51.11%> (-0.01%)	⬇️
keras-tensorflow	65.90% <55.55%> (-0.01%)	⬇️
keras-torch	64.85% <48.88%> (-0.02%)	⬇️

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[fchollet]

Thanks for the PR!

[fchollet]

LGTM -- thank you for the contribution!