Implementation of ACTS-based pixel clustering

Implementation of ACTS-based pixel clustering tool and algorithm. An new flag, ITk.Tracking.EnableNativexAODclusters, is added to gate this new feature.

In addition, the code leverages the existing ClusterMakerTool, therefore it has been modified to be able to natively create xAOD::PixelCluster's.

cc @cvarni @toyamaza @tbold @asalzbur @pagessin

assigned to @lgagnon

This merge request affects 2 packages:

• InnerDetector/InDetRecTools/SiClusterizationTool
• Tracking/Acts/ActsClusterization

Affected files list will not be printed in this case

Adding @goetz ,@amorley ,@battagl ,@sroe ,@pagessin ,@stsuno ,@lshan ,@cvarni as watchers

added ACTS InnerDetector Tracking master review-pending-level-1 labels

marked this merge request as draft

removed review-pending-level-1 label

changed the description

Please move the ActsClusterization package to Tracking/Acts/ActsTrkTools as ActsTrkClusterization, according to our convention