Add bundled version of googletest for Arccore

[grospelliergilles]

This will help to make sure googletest use the same compilation options than Arccore.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 15.69507% with 188 lines in your changes are missing coverage. Please review.

Project coverage is 68.38%. Comparing base (59423f1) to head (cc67d33). Report is 1 commits behind head on main.

Files	Patch %	Lines
...ogletest/googletest/include/gtest/gtest-printers.h	0.00%	97 Missing :warning:
...ogletest/include/gtest/internal/gtest-param-util.h	0.00%	29 Missing :warning:
...extras/googletest/googletest/include/gtest/gtest.h	34.37%	19 Missing and 2 partials :warning:
...oogletest/include/gtest/internal/gtest-type-util.h	0.00%	17 Missing :warning:
.../googletest/include/gtest/gtest-assertion-result.h	18.18%	9 Missing :warning:
...oogletest/googletest/include/gtest/gtest-message.h	0.00%	6 Missing :warning:
...googletest/include/gtest/internal/gtest-internal.h	81.48%	4 Missing and 1 partial :warning:
...est/googletest/include/gtest/internal/gtest-port.h	0.00%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1202      +/-   ##
==========================================
- Coverage   68.46%   68.38%   -0.08%     
==========================================
  Files        2050     2058       +8     
  Lines      149478   149701     +223     
  Branches    17243    17274      +31     
==========================================
+ Hits       102337   102379      +42     
- Misses      41011    41190     +179     
- Partials     6130     6132       +2     

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