Migrate cluster track associator (#409)

Migrate ClusterTPAssociationHeterogeneous using the depreacted HeterogeneousEDProducer to
ClusterTPAssociationProducerCUDA, and implement a simple analyzer to consume its procuct.

To test it, add a dummy analyzer to an MC workflow:

    process.load("SimTracker.TrackerHitAssociation.clusterTPCUDAdump_cfi")
    process.validation_step = cms.EndPath(process.globalValidationPixelTrackingOnly + process.clusterTPCUDAdump)
    process.tpClusterProducerCUDAPreSplitting.dumpCSV = True

Validation/RecoTrack/python/TrackValidation_cff.py

@@ -485,13 +485,11 @@ def _getMVASelectors(postfix):
 # Built tracks, in the standard sequence mainly for monitoring the track selection MVA
 tpClusterProducerPreSplitting = tpClusterProducer.clone(pixelClusterSrc = "siPixelClustersPreSplitting")
 quickTrackAssociatorByHitsPreSplitting = quickTrackAssociatorByHits.clone(cluster2TPSrc = "tpClusterProducerPreSplitting")
-tpClusterProducerHeterogeneousPreSplitting = tpClusterProducerHeterogeneous.clone(
+
+tpClusterProducerCUDAPreSplitting = tpClusterProducerCUDA.clone(
    pixelClusterSrc = "siPixelClustersPreSplitting"
 )
-from Configuration.ProcessModifiers.gpu_cff import gpu
-gpu.toReplaceWith(tpClusterProducerPreSplitting, tpClusterProducerConverter.clone(
-    src = "tpClusterProducerHeterogeneousPreSplitting"
-))
+
 _trackValidatorSeedingBuilding = trackValidator.clone( # common for built tracks and seeds (in trackingOnly)
     associators = ["quickTrackAssociatorByHits"],
     UseAssociators = True,
@@ -595,14 +593,23 @@ def _uniqueFirstLayers(layerList):
 )
 tracksValidationTruth = cms.Task(
     tpClusterProducer,
-    tpClusterProducerHeterogeneousPreSplitting,
     tpClusterProducerPreSplitting,
     quickTrackAssociatorByHits,
     quickTrackAssociatorByHitsPreSplitting,
     trackingParticleRecoTrackAsssociation,
     VertexAssociatorByPositionAndTracks,
     trackingParticleNumberOfLayersProducer
 )
+
+#gpu tp ???
+from Configuration.ProcessModifiers.gpu_cff import gpu
+tpClusterProducerPreSplittingCUDA = cms.Task(
+  tpClusterProducerCUDAPreSplitting
+)
+_tracksValidationTruth_gpu = tracksValidationTruth.copy()
+_tracksValidationTruth_gpu.add(tpClusterProducerPreSplittingCUDA)
+gpu.toReplaceWith(tracksValidationTruth,_tracksValidationTruth_gpu)
+
 fastSim.toModify(tracksValidationTruth, lambda x: x.remove(tpClusterProducer))
 
 tracksPreValidation = cms.Task(