[ALICE 3] Implementation of peacock layour for services

[marcovanleeuwen]

This implements the peacock layout for the ALICE 3 services and introduces a configuration parameter that allows to switch between the previus layout (symmetric, used in the LoI) and the new layout.

This was presented at the IT/OT MC meeting: https://indico.cern.ch/event/1655359/contributions/6957996/attachments/3231061/5759501/20260304_OT_services_update_mvl.pdf

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 0ae50be at 2026-03-05 17:10:

## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:669:146: error: use nullptr [modernize-use-nullptr]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:712:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:722:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:736:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:745:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:769:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:777:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:791:46: error: statement should be inside braces [readability-braces-around-statements]
/sw/SOURCES/O2/15122-slc9_x86-64/0/Detectors/Upgrades/ALICE3/TRK/simulation/src/TRKServices.cxx:799:46: error: statement should be inside braces [readability-braces-around-statements]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.