[PWGLF] Strangeness builder work: PCM treatment, bufferizing option, etc

[ddobrigk]

• [strangeness builder] adds a configurable useV0BufferForCascades to determine if the builder should save V0s used in cascades (uses more memory, less CPU) or if it should re-generate from scratch for each cascade (saves memory, uses more CPU). Ideal also when pipelining the strangeness builder (smaller memory footprint per device).
• [strangeness builder] adds a de-duplication procedure for dealing with v0Type>1 V0s (i.e. photon conversion candidates). The algorithm for de-duplication can be set via deduplicationAlgorithm. Three options are added for testing: best CosPA, best DCA daughters and best CosPA + DCA daughters (consistent with EM techniques).
• [strangeness builder helper] adds a function to recognize and group duplicated V0s at the aod::V0s level for ease of handling. Adds the possibility to skip all selections in the V0 building (necessary for de-duplication procedure). Adds an 'empty out content' command whenever a candidate is not successfully built.
• [v0assoqa] adds a QC task to study the de-duplication procedure. Uses the full modularity of the strangeness builder helper to test. Not meant to be used as analysis but rather as development QC for the strangeness builder.

Tagging @gianniliveraro

[alibuild]

Error while checking build/O2Physics/o2 for 2da02ca at 2025-04-13 11:09:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/10811-slc9_x86-64/0/PWGLF/Tasks/QC/v0assoqa.cxx:469:49: error: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Werror=sign-compare]
/sw/SOURCES/O2Physics/10811-slc9_x86-64/0/PWGLF/Tasks/QC/v0assoqa.cxx:228:32: error: unused variable 'grpo' [-Werror=unused-variable]
ninja: build stopped: subcommand failed.

Full log here.