Delete the unused class

indexer-core/src/main/java/org/opengroup/osdu/indexer/schema/converter/ConverterConstants.java

-package org.opengroup.osdu.indexer.schema.converter;
-
-public final class ConverterConstants {
-    public static final String PROPERTY_CONFIGURATION = "propertyConfiguration";
-    public static final String PROPERTY_PATH = "path";
-    public static final String PROPERTY_KIND = "kind";
-
-    public ConverterConstants() {
-
-    }
-}