[WIP] Fix on destructors not being called by o2sim

[jackal1-66]

Most generators destructors are default ones, however by using the HepMC generator I noticed that the destructor was not called when the simulation terminates. This called for a series of modifications:

• Replaced new operator for generator instances with smart pointers (template of vectors of unique_ptr)
• Modification of child process spawning in GeneratorFileorCmd => if this was not done then there was no way of killing the child process which could be left hanging writing on file while the full simulation is shutting down (this was a clear problem when using EPOS4 example).
• Edited GeneratorHepMC destructor in order to call terminateCmd() BEFORE removing the temporary file (if cmd is not empty)

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI for 03913e4 at 2024-12-09 08:06:

## sw/BUILD/O2Physics-latest/log
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:
Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/13769-slc8_x86-64/0/Generators/src/GeneratorFileOrCmd.cxx:20:10: error: inclusion of deprecated C++ header 'signal.h'; consider using 'csignal' instead [modernize-deprecated-headers]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.

[jackal1-66]

GeneratorService is failing, the PR requires more adjustments, not to be merged for the moment

[alibuild]

Error while checking build/O2/fullCI_slc9 for 22bfb67 at 2024-12-09 12:42:

## sw/BUILD/O2-latest/log
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2/fullCI for 22bfb67 at 2024-12-11 17:38:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/13769-slc8_x86-64/0/Generators/src/GeneratorFileOrCmd.cxx:20:10: error: inclusion of deprecated C++ header 'signal.h'; consider using 'csignal' instead [modernize-deprecated-headers]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.

[jackal1-66]

Setting [WIP] in the PR title. O2sim tests work, but GeneratorService test fails and more debug is needed.

[sawenzel]

Closing. Alternative PR #13817 merged.