This is the first commit of this task. It adds the two-particle angular

correlation (Δφ, Δη) analysis in pp collisions at 13 TeV, structured in
parallel with the AliRoot AliMESppColTask analysis, to
PWGCF/TwoParticleCorrelations.

Adds an analysis task (o2-analysis-cf-two-particle-correlations-mult-spher)
that fills same-event and mixed-event Δφ-Δη correlation histograms
(THnSparse for the full multi-dimensional binning, plus direct TH2D
SE/ME pairs for both per-trigger and per-pair normalisation), differential
in multiplicity class and transverse sphericity class, at both MC generator level and
reconstructed level. Some selection variants are kept togglable via
Configurables for methodology cross-checks.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YbYBgosEJaDJTkCuqAtNHk

Author: matarzil

PWGCF/TwoParticleCorrelations/Tasks/CMakeLists.txt

@@ -142,3 +142,8 @@ o2physics_add_dpl_workflow(fox-wolfram-correlation
                            SOURCES FoxWolframCorrelation.cxx
                            PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore
                            COMPONENT_NAME Analysis)
+
+o2physics_add_dpl_workflow(two-particle-correlations-mult-spher
+                           SOURCES twoParticleCorrelationsMultSpher.cxx
+                           PUBLIC_LINK_LIBRARIES O2::Framework O2Physics::AnalysisCore
+                           COMPONENT_NAME Analysis)