AthContainers: Add JaggedVecConstAccessor.

This merge request affects 1 package:

Control/AthContainers

This merge request affects 14 files:

Control/AthContainers/AthContainers/JaggedVec.h
Control/AthContainers/AthContainers/JaggedVecConstAccessor.h
Control/AthContainers/AthContainers/JaggedVecConstAccessor.icc
Control/AthContainers/AthContainers/tools/JaggedVecConversions.h
Control/AthContainers/AthContainers/tools/JaggedVecConversions.icc
Control/AthContainers/AthContainers/tools/LinkedVarAccessorBase.h
Control/AthContainers/AthContainers/tools/LinkedVarAccessorBase.icc
Control/AthContainers/CMakeLists.txt
Control/AthContainers/share/JaggedVecConstAccessor_test.ref
Control/AthContainers/share/JaggedVecConversions_test.ref
Control/AthContainers/share/LinkedVarAccessorBase_test.ref
Control/AthContainers/test/JaggedVecConstAccessor_test.cxx
Control/AthContainers/test/JaggedVecConversions_test.cxx
Control/AthContainers/test/LinkedVarAccessorBase_test.cxx

Adding @ssnyder as watcher

added Core analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash 3a4ec4aa)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 14158] (remote access info)