refactor: remove constraint collector int overloads (#2190)

Counterparts:
TimefoldAI/timefold-quickstarts#1039
TimefoldAI/timefold-solver-benchmarks#119

Author: triceo

core/src/main/java/ai/timefold/solver/core/api/score/stream/ConstraintCollectors.java

@@ -1,8 +1,8 @@
 package ai.timefold.solver.core.impl.score.stream.collector;
 
 public sealed interface ObjectCalculator<Input_, Output_, Mapped_>
-        permits ConnectedRangesCalculator, IntDistinctCountCalculator, LongDistinctCountCalculator, ReferenceAverageCalculator,
-        ReferenceSumCalculator, SequenceCalculator {
+        permits ConnectedRangesCalculator, LongDistinctCountCalculator, ReferenceAverageCalculator, ReferenceSumCalculator,
+        SequenceCalculator {
     Mapped_ insert(Input_ input);
 
     void retract(Mapped_ mapped);

core/src/main/java/ai/timefold/solver/core/impl/score/stream/collector/IntAverageCalculator.java

@@ -7,8 +7,8 @@
 
 import org.jspecify.annotations.NonNull;
 
-final class AverageLongBiCollector<A, B> extends LongCalculatorBiCollector<A, B, Double, LongAverageCalculator> {
-    AverageLongBiCollector(ToLongBiFunction<? super A, ? super B> mapper) {
+final class AverageBiCollector<A, B> extends LongCalculatorBiCollector<A, B, Double, LongAverageCalculator> {
+    AverageBiCollector(ToLongBiFunction<? super A, ? super B> mapper) {
         super(mapper);
     }
 

core/src/main/java/ai/timefold/solver/core/impl/score/stream/collector/IntCalculator.java

@@ -9,15 +9,15 @@
 
 import org.jspecify.annotations.NonNull;
 
-final class CountLongBiCollector<A, B> implements BiConstraintCollector<A, B, LongCounter, Long> {
-    private final static CountLongBiCollector<?, ?> INSTANCE = new CountLongBiCollector<>();
+final class CountBiCollector<A, B> implements BiConstraintCollector<A, B, LongCounter, Long> {
+    private static final CountBiCollector<?, ?> INSTANCE = new CountBiCollector<>();
 
-    private CountLongBiCollector() {
+    private CountBiCollector() {
     }
 
     @SuppressWarnings("unchecked")
-    static <A, B> CountLongBiCollector<A, B> getInstance() {
-        return (CountLongBiCollector<A, B>) INSTANCE;
+    static <A, B> CountBiCollector<A, B> getInstance() {
+        return (CountBiCollector<A, B>) INSTANCE;
     }
 
     @Override