[Algs] Implement modernGPU merge sort

[tdavidcl]

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[github-actions]

Thanks @tdavidcl for opening this PR!

You can do multiple things directly here:
1 - Comment pre-commit.ci run to run pre-commit checks.
2 - Comment pre-commit.ci autofix to apply fixes.
3 - Add label autofix.ci to fix authorship & pre-commit for every commit made.
4 - Add label full-ci to run the full test suite (default is light CI; full CI also runs on Mergify merge-queue branches).
5 - Add label profile-build to run the compile-time build profile job even in light CI.
6 - Add label trigger-ci to create an empty commit to trigger the CI.

Once the workflow completes a message will appear displaying informations related to the run.

Also the PR gets automatically reviewed by gemini, you can:
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2 - Comment /gemini summary for a summary
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