Trim down PR apache#2506: Remove configuration and statistics

This commit removes the following components from the comprehensive PR apache#2506:
- CacheConfigurationResolver and related configuration classes
- CacheStatistics and related statistics tracking
- Cache configuration parsing and system property handling
- Factory methods from InputSource and InputLocation (merge methods)
- Complex object pooling configuration (keeping only Dependency pooling)

Remaining work:
- Fix compilation errors for missing interfaces
- Adapt to current master branch API structure
- Ensure all tests pass

This trimmed version keeps the core cache improvements while removing
the configuration complexity that's not needed for the 4.0.x branch.

Author: gnodet

api/maven-api-model/src/main/java/org/apache/maven/api/model/InputLocation.java

@@ -182,75 +182,9 @@ public InputLocation getImportedFrom() {
         return importedFrom;
     }
 
-    /**
-     * Merges the {@code source} location into the {@code target} location.
-     *
-     * @param target the target location
-     * @param source the source location
-     * @param sourceDominant the boolean indicating of {@code source} is dominant compared to {@code target}
-     * @return the merged location
-     */
-    public static InputLocation merge(InputLocation target, InputLocation source, boolean sourceDominant) {
-        if (source == null) {
-            return target;
-        } else if (target == null) {
-            return source;
-        }
-
-        Map<Object, InputLocation> locations;
-        Map<Object, InputLocation> sourceLocations = source.locations;
-        Map<Object, InputLocation> targetLocations = target.locations;
-        if (sourceLocations == null) {
-            locations = targetLocations;
-        } else if (targetLocations == null) {
-            locations = sourceLocations;
-        } else {
-            locations = new LinkedHashMap<>();
-            locations.putAll(sourceDominant ? targetLocations : sourceLocations);
-            locations.putAll(sourceDominant ? sourceLocations : targetLocations);
-        }
-
-        return new InputLocation(-1, -1, InputSource.merge(source.getSource(), target.getSource()), locations);
-    } // -- InputLocation merge( InputLocation, InputLocation, boolean )
 
-    /**
-     * Merges the {@code source} location into the {@code target} location.
-     * This method is used when the locations refer to lists and also merges the indices.
-     *
-     * @param target the target location
-     * @param source the source location
-     * @param indices the list of integers for the indices
-     * @return the merged location
-     */
-    public static InputLocation merge(InputLocation target, InputLocation source, Collection<Integer> indices) {
-        if (source == null) {
-            return target;
-        } else if (target == null) {
-            return source;
-        }
 
-        Map<Object, InputLocation> locations;
-        Map<Object, InputLocation> sourceLocations = source.locations;
-        Map<Object, InputLocation> targetLocations = target.locations;
-        if (sourceLocations == null) {
-            locations = targetLocations;
-        } else if (targetLocations == null) {
-            locations = sourceLocations;
-        } else {
-            locations = new LinkedHashMap<>();
-            for (int index : indices) {
-                InputLocation location;
-                if (index < 0) {
-                    location = sourceLocations.get(~index);
-                } else {
-                    location = targetLocations.get(index);
-                }
-                locations.put(locations.size(), location);
-            }
-        }
 
-        return new InputLocation(-1, -1, InputSource.merge(source.getSource(), target.getSource()), locations);
-    } // -- InputLocation merge( InputLocation, InputLocation, java.util.Collection )
 
     @Override
     public boolean equals(Object o) {

api/maven-api-model/src/main/java/org/apache/maven/api/model/InputSource.java

@@ -165,8 +165,5 @@ public String toString() {
         return getModelId() + " " + getLocation();
     }
 
-    public static InputSource merge(InputSource src1, InputSource src2) {
-        return new InputSource(
-                Stream.concat(src1.sources(), src2.sources()).distinct().toList());
-    }
+
 }