Move Java wrappers to FFM using jextract and java 25 (#5957)

FFM build requires Java 25, Jextract 25.
Generates FFM bindings during configure.
JNI is default when the requirements are not met or can be forced.
Presets added for maven and FFM - JNI is default selection.
Enhanced Maven options will work with either JNI or FFM
New Workflows for testing and maven uploads.
Extensive documentation changes for java.

java/test/TestH5Ocreate.java

@@ -17,6 +17,7 @@ import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import java.io.File;
+import java.lang.foreign.MemorySegment;
 import java.util.ArrayList;
 
 import hdf.hdf5lib.H5;
@@ -27,6 +28,7 @@ import hdf.hdf5lib.exceptions.HDF5Exception;
 import hdf.hdf5lib.exceptions.HDF5LibraryException;
 import hdf.hdf5lib.structs.H5O_info_t;
 
+import org.hdfgroup.javahdf5.H5L_info2_t;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Ignore;
@@ -412,14 +414,15 @@ public class TestH5Ocreate {
             }
         }
         class H5O_iter_data implements H5O_iterate_opdata_t {
-            public ArrayList<idata> iterdata = new ArrayList<idata>();
+            static public ArrayList<idata> iterdata = new ArrayList<idata>();
+            static void add_iter_data(idata id) { iterdata.add(id); }
         }
         H5O_iterate_opdata_t iter_data = new H5O_iter_data();
         class H5O_iter_callback implements H5O_iterate_t {
-            public int callback(long group, String name, H5O_info_t info, H5O_iterate_opdata_t op_data)
+            public int apply(long group, MemorySegment name, MemorySegment info, MemorySegment op_data)
             {
-                idata id = new idata(name, info.type);
-                ((H5O_iter_data)op_data).iterdata.add(id);
+                idata id = new idata(name.getString(0), H5L_info2_t.type(info));
+                ((H5O_iter_data)iter_data).add_iter_data(id);
                 return 0;
             }
         }