MaterialManager: Allow density modification on the individual materia…

[sawenzel]

…l level

We can now scale the material density beyond the module level. We simply need to use "MODULENAME/MATERIAL" strings in the configurable param.

Matching on individual material takes precedence over matching on the module level.

An example is

o2-sim --configKeyValues "SimMaterialParams.localDensityFactor=TPC/Air:1.2,TPC:2.0,ITS:5."

which will scale TPC air with a factor 1.2, the rest of TPC with factor 2.0 and all of ITS with factor 5.0

Fixes https://its.cern.ch/jira/browse/O2-6294

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[sawenzel]

@alcaliva

[alibuild]

Error while checking build/O2/fullCI_slc9 for 08d5b55 at 2025-09-10 00:37:

## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
error: error: clang-tidy: Unknown command line argument '--load /sw/slc9_x86-64/o2codechecker/v20.1.7-local2/lib/libclangTidyAliceO2Module.so --extra-arg=--gcc-install-dir='.  Try: '/sw/slc9_x86-64/Clang/v20.1.7-1/bin-safe/clang-tidy --help'
error: error: clang-tidy: Unknown command line argument '--load /sw/slc9_x86-64/o2codechecker/v20.1.7-local2/lib/libclangTidyAliceO2Module.so --extra-arg=--gcc-install-dir='.  Try: '/sw/slc9_x86-64/Clang/v20.1.7-1/bin-safe/clang-tidy --help'
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.