implementation of logaddexp in openvino backend (issue #29489)

[mathys-mt]

I implemented the numpy logaddexp function in openvino backend using functions already coded in this file. The tests seem to pass, but maybe implementing logaddexp from zero without using the openvino numpy functions would be more effective. @rkazants could you review the PR ?

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.61%. Comparing base (55adc57) to head (433bb34). Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21216      +/-   ##
==========================================
+ Coverage   82.60%   82.61%   +0.01%     
==========================================
  Files         564      564              
  Lines       54404    54454      +50     
  Branches     8460     8467       +7     
==========================================
+ Hits        44938    44986      +48     
- Misses       7391     7395       +4     
+ Partials     2075     2073       -2     

Flag	Coverage Δ
keras	82.42% <100.00%> (+0.01%)	:arrow_up:
keras-jax	63.74% <0.00%> (-0.01%)	:arrow_down:
keras-numpy	58.86% <0.00%> (-0.01%)	:arrow_down:
keras-openvino	32.96% <100.00%> (+<0.01%)	:arrow_up:
keras-tensorflow	64.14% <0.00%> (-0.01%)	:arrow_down:
keras-torch	63.81% <0.00%> (-0.02%)	:arrow_down:

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[rkazants]

do NOT merge!!!

[github-actions[bot]]

This PR is stale because it has been open for 14 days with no activity. It will be closed if no further activity occurs. Thank you.

[hertschuh]

This was implemented by https://github.com/keras-team/keras/pull/21522