Implement OpenVINO Decomposition for numpy.hstack Operation

[Hmm-1224]

@rkazants, please check out this PR

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.80488% with 10 lines in your changes missing coverage. Please review.

Project coverage is 82.45%. Comparing base (eb1f844) to head (7b6abb6).
Report is 16 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/numpy.py	87.80%	5 Missing and 5 partials ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #21017    +/-   ##
========================================
  Coverage   82.45%   82.45%            
========================================
  Files         562      562            
  Lines       53303    53676   +373     
  Branches     8257     8329    +72     
========================================
+ Hits        43949    44257   +308     
- Misses       7338     7379    +41     
- Partials     2016     2040    +24     

Flag	Coverage Δ
keras	82.27% <87.80%> (+<0.01%)	⬆️
keras-jax	63.69% <0.00%> (-0.35%)	⬇️
keras-numpy	58.66% <0.00%> (-0.19%)	⬇️
keras-openvino	32.69% <87.80%> (+<0.01%)	⬆️
keras-tensorflow	64.14% <0.00%> (-0.34%)	⬇️
keras-torch	63.73% <0.00%> (-0.36%)	⬇️

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