[shamcomm] add a timeout detection watchdog thread

[tdavidcl]

A background thread aborts the run if it is not woken up regularly. On timeout it raises SIGABRT on the main thread so the crash handler reports the main thread backtrace, with an MPI_Abort fallback.

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[github-actions]

Thanks @tdavidcl for opening this PR!

You can do multiple things directly here:
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[github-actions]

Workflow report

workflow report corresponding to commit cd66a38
Commiter email is timothee.davidcleris@proton.me

Light CI is enabled (the default for pull requests). This will only run the basic tests and not the full tests.
Full CI runs if the full-ci label is set, or automatically on Mergify merge-queue branches (mergify/merge-queue/*).
The merge gate job "on PR / all" is skipped in this case. Queue entry uses "on PR / all_light"; full CI runs in the merge queue.

Pre-commit check report

Pre-commit check: ✅

trim trailing whitespace.................................................Passed
fix end of files.........................................................Passed
check for merge conflicts................................................Passed
check that executables have shebangs.....................................Passed
check that scripts with shebangs are executable..........................Passed
check for added large files..............................................Passed
check for case conflicts.................................................Passed
check for broken symlinks................................................Passed
check yaml...............................................................Passed
detect private key.......................................................Passed
No-tabs checker..........................................................Passed
Tabs remover.............................................................Passed
cmake-format.............................................................Passed
Validate GitHub Workflows................................................Passed
clang-format.............................................................Passed
ruff check...............................................................Passed
ruff format..............................................................Passed
Check doxygen headers....................................................Passed
Check license headers....................................................Passed
Check #pragma once.......................................................Passed
Check SYCL #include......................................................Passed
No ssh in git submodules remote..........................................Passed
No UTF-8 in files (except for authors)...................................Passed

Test pipeline can run.

Clang-tidy diff report

No relevant changes found.
Well done!

You should now go back to your normal life and enjoy a hopefully sunny day while waiting for the review.

Doxygen diff with main

Removed warnings : 0
New warnings : 0
Warnings count : 8184 → 8184 (0.0%)

Detailed changes :