[PWGLF] Add dN/deta analysis task for heavy-ion collisions

Add dndetaHi.cxx implementing the DndetaHi DPL task that measures
charged-particle pseudorapidity density in pp and Pb-Pb collisions.
Register the new workflow in CMakeLists.txt.

Key features:
- Five process functions: EventStat, MCCounting, Counting, Gen, V0Counting
- Event classification: INEL, INEL>0, DD/SD/ND (via HepMC process ID)
- Centrality via FT0M (pp) or FT0C (Pb-Pb)
- MC particle ID (π/K/p) and strange-mother tagging
- pT extrapolation systematic variations (up/down weights)
- V0 topological selection for K0s, Λ, Λ̄

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyungjun-lee

PWGLF/Tasks/GlobalEventProperties/CMakeLists.txt

@@ -43,3 +43,8 @@ o2physics_add_dpl_workflow(nch-studypp
     SOURCES nchStudypp.cxx
     PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore
     COMPONENT_NAME Analysis)
+
+o2physics_add_dpl_workflow(dndeta-hi
+    SOURCES dndetaHi.cxx
+    PUBLIC_LINK_LIBRARIES O2Physics::AnalysisCore O2Physics::AnalysisCCDB O2::Framework
+    COMPONENT_NAME Analysis)