Add an engine to apply new AI models for forward track finding (#1039)

* add engine to apply a new AI model for DC cluster combo prediction

* change deafult threshold

* Switch to generic predictor pool (#1040)

* add generic predictor pool

* cleanup

---------

Co-authored-by: Nathan Baltzell <baltzell@gmx.com>

Author: tongtongcao

reconstruction/ai/src/main/java/org/jlab/rec/ai/dcCluster/DCCluster.java

@@ -0,0 +1,39 @@
+package org.jlab.rec.ai.dcCluster;
+
+
+public class DCCluster{
+    int id;
+    int sector;
+    int superlayer;
+    float avgWire;
+    float fitSlope;
+    
+    public DCCluster(int id, int sector, int superlayer, float avgWire, float fitSlope){
+    this.id = id;
+    this.sector = sector;
+    this.superlayer = superlayer;
+    this.avgWire = avgWire;
+    this.fitSlope = fitSlope;
+    }
+    
+    public int getId(){
+        return id;
+    }
+    
+    public int getSector(){
+        return sector;
+    }
+    
+    public int getSuperlayer(){
+        return superlayer;
+    }
+    
+    public float getAvgWire(){
+        return avgWire;
+    }
+    
+    public float getFitSlope(){
+        return fitSlope;
+    }
+        
+}

reconstruction/ai/src/main/java/org/jlab/rec/ai/dcCluster/DCClusterCombo.java

@@ -0,0 +1,40 @@
+package org.jlab.rec.ai.dcCluster;
+
+import java.util.List;
+import java.util.ArrayList;
+
+public class DCClusterCombo extends ArrayList<DCCluster> {
+    
+    private int id = -1;
+    private int missingSL = -1;
+    private float probability = -1;
+
+    public DCClusterCombo(List<DCCluster> clsList) {
+        super(clsList); 
+    }
+    
+    public DCClusterCombo(List<DCCluster> clsList, int missingSL) {
+        super(clsList); 
+        this.missingSL = missingSL;
+    }    
+
+    public int getMissingSL() {
+        return missingSL;
+    }
+    
+    public void setProbability(float probability){
+        this.probability = probability;
+    }
+    
+    public float getProbability(){
+        return probability;
+    }
+    
+    public void setId(int id){
+        this.id = id;
+    }
+    
+    public int getId(){
+        return id;
+    }    
+}