fix: make FactoryLoader.java methods public (#489)

Co-authored-by: g00563573 <L0kuj;lfyysq>

asto-core/src/main/java/com/artipie/asto/factory/FactoryLoader.java

@@ -52,30 +52,30 @@ protected FactoryLoader(final Class<A> annot, final Map<String, String> env) {
      * Default package name.
      * @return The name of the default scan package
      */
-    abstract String defPackage();
+    public abstract String defPackage();
 
     /**
      * Environment parameter to define packages to find factories.
      * Package names should be separated by semicolon ';'.
      * @return Env param name
      */
-    abstract String scanPackagesEnv();
+    public abstract String scanPackagesEnv();
 
     /**
      * Find factory by name and create object.
      * @param name The factory name
      * @param config Configuration
      * @return The object
      */
-    abstract O newObject(String name, C config);
+    public abstract O newObject(String name, C config);
 
     /**
      * Get the name of the factory from provided element. Call {@link Class#getAnnotations()}
      * method on the element, filter required annotations and get factory implementation name.
      * @param element Element to get annotations from
      * @return The name of the factory
      */
-    abstract String getFactoryName(Class<?> element);
+    public abstract String getFactoryName(Class<?> element);
 
     /**
      * Finds and initiates annotated classes in default and env packages.

asto-core/src/main/java/com/artipie/asto/factory/StoragesLoader.java

@@ -69,7 +69,7 @@ public String scanPackagesEnv() {
     }
 
     @Override
-    String getFactoryName(final Class<?> element) {
+    public String getFactoryName(final Class<?> element) {
         return Arrays.stream(element.getAnnotations())
             .filter(ArtipieStorageFactory.class::isInstance)
             .map(a -> ((ArtipieStorageFactory) a).value())