[ALICE3] Implementation of prefilter and PID for ALICE 3

[rbailhac]

First implementation of prefilter and PID for ALICE 3 FAT (before introducing a method to use resolution maps from ACTS and PID efficiency from full simulation)

[github-actions]

O2 linter results: ❌ 61 errors, ⚠️ 91 warnings, 🔕 0 disabled

[alibuild]

Error while checking build/O2Physics/staging for 3558e99 at 2026-06-16 16:24:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-prefilterdilepton.cxx:293:22: error: unused variable 'track' [-Werror=unused-variable]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-dilepton.cxx:221:43: error: unused parameter 'mcParticles' [-Werror=unused-parameter]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-dilepton.cxx:817:45: error: unused parameter 'tracks' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2Physics/o2 for 3558e99 at 2026-06-16 16:28:

## sw/BUILD/O2Physics-latest/log
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-prefilterdilepton.cxx:293:22: error: unused variable 'track' [-Werror=unused-variable]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-dilepton.cxx:221:43: error: unused parameter 'mcParticles' [-Werror=unused-parameter]
/sw/SOURCES/O2Physics/slc9_x86-64-slc9_x86-64/0/ALICE3/Tasks/alice3-dilepton.cxx:817:45: error: unused parameter 'tracks' [-Werror=unused-parameter]
ninja: build stopped: subcommand failed.

Full log here.

[rbailhac]

Hi @jesgum , @njacazio , @hscheid , could you maybe have a look at this pull request and let me know if it is ok for you ? Thanks