[OpenVINO backend] support tri, triu, and tril

[Mohamed-Ashraf273]

Hi @rkazants
I've supported tri, triu and tril, and they are ready for review.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.98246% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.82%. Comparing base (d55a767) to head (4b66e60).

Files with missing lines	Patch %	Lines
keras/src/backend/openvino/numpy.py	92.98%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21408      +/-   ##
==========================================
+ Coverage   82.81%   82.82%   +0.01%     
==========================================
  Files         565      565              
  Lines       55520    55577      +57     
  Branches     8664     8673       +9     
==========================================
+ Hits        45977    46030      +53     
- Misses       7428     7430       +2     
- Partials     2115     2117       +2     

Flag	Coverage Δ
keras	82.63% <92.98%> (+0.01%)	⬆️
keras-jax	63.32% <0.00%> (-0.07%)	⬇️
keras-numpy	58.52% <0.00%> (-0.07%)	⬇️
keras-openvino	34.07% <92.98%> (+0.08%)	⬆️
keras-tensorflow	63.77% <0.00%> (-0.07%)	⬇️
keras-torch	63.43% <0.00%> (-0.07%)	⬇️

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[Mohamed-Ashraf273]

@rkazants
they are ready.

[rkazants]

@fchollet, looks good to me. Recommend to merge.

[Mohamed-Ashraf273]

@fchollet

[fchollet]

Thank you!