[OpenVINO Backend] support while_loop

[Mohamed-Ashraf273]

Hi @rkazants ,
I've supported ops.while_loop, and it is ready for review.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.52542% with 5 lines in your changes missing coverage. Please review.

Project coverage is 77.77%. Comparing base (771b001) to head (4aef927).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/core.py	91.52%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21369      +/-   ##
==========================================
- Coverage   82.70%   77.77%   -4.94%     
==========================================
  Files         565      565              
  Lines       54894    55129     +235     
  Branches     8517     8585      +68     
==========================================
- Hits        45398    42874    -2524     
- Misses       7415    10231    +2816     
+ Partials     2081     2024      -57     

Flag	Coverage Δ
keras	77.61% <91.52%> (-4.90%)	⬇️
keras-jax	?
keras-numpy	58.60% <0.00%> (-0.12%)	⬇️
keras-openvino	33.53% <91.52%> (-0.01%)	⬇️
keras-tensorflow	63.83% <0.00%> (-0.13%)	⬇️
keras-torch	63.46% <0.00%> (-0.15%)	⬇️

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[Mohamed-Ashraf273]

Hi @rkazants ,
I've modified ops.while_loop as you suggested and it is ready for review.

[rkazants]

@fchollet, looks good to me. Recommend to merge

[fchollet]

Thanks for the PR!