Add MultiComponentState DataVector and put back dict

• Rel 21 had a selection.xml, Dict.h put these back

• Also since Tracking uses DataVector make a bit explict MultiComponentStateOnSurface iherits.

• Now we can have class DataVector<Trk::MultiComponentStateOnSurface const,DataVector<Trk::TrackStateOnSurface const,DataModel_detail::NoBase> >

• On top of class DataVector<Trk::TrackStateOnSurface const,DataModel_detail::NoBase>

changed the description

This merge request affects 1 package:

• Tracking/TrkEvent/TrkMultiComponentStateOnSurface

Adding @amorley as watcher

added Tracking master review-pending-level-1 labels

CI Result FAILURE (hash 1a180c42)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
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
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 18634]

CI failures unrelated to MR. Aproving (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 0497ff30

added sweep:ignore label