numpy.meshgrid implementation

[sanleo-wq]

issue: #30116

Follows the same pattern as other similar functions in the file
Passes all tests
I've removed the test from the excluded tests list, which allows for proper validation of the functionality.

@rkazants for review
All tests are passing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Project coverage is 79.74%. Comparing base (dfaca0e) to head (2ddf04b).
Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/numpy.py	0.00%	28 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21292      +/-   ##
==========================================
- Coverage   82.57%   79.74%   -2.84%     
==========================================
  Files         564      564              
  Lines       54677    54702      +25     
  Branches     8500     8508       +8     
==========================================
- Hits        45152    43621    -1531     
- Misses       7435     9053    +1618     
+ Partials     2090     2028      -62     

Flag	Coverage Δ
keras	79.56% <0.00%> (-2.83%)	⬇️
keras-jax	63.58% <0.00%> (-0.04%)	⬇️
keras-numpy	58.71% <0.00%> (-0.04%)	⬇️
keras-openvino	?
keras-tensorflow	63.99% <0.00%> (-0.04%)	⬇️
keras-torch	63.64% <0.00%> (-0.04%)	⬇️

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