[java] Adding native library loader to SessionOptions and RunOptions static init (#16435)

### Description
Unlike most ORT classes `SessionOptions` and `RunOptions` don't trigger
native library loading of the JNI binding and ORT when the classes are
initialized (after class loading). This was initially because I thought
that loading an inner class would trigger the static initialization of
the outer class, but this is not true. So if you create a
`SessionOptions` instance before referencing `OrtEnvironment` then you
won't trigger library loading and you'll get an error saying it couldn't
link the native method that creates a `SessionOptions` object.

Note this doesn't prevent users from creating a `SessionOptions` and
modifying it before the `OrtEnvironment` is created, which can still
cause issues. It would be a breaking API change to modify the
`SessionOptions` constructor to take an environment, and it wouldn't
mirror the way it works in the C API which requires this by convention
rather than API design, but we can discuss making that modification
later.

### Motivation and Context
Reduces the occurrence of mysterious Java library loading errors. Helps
with #16434.

java/src/main/java/ai/onnxruntime/OrtSession.java

@@ -517,6 +517,14 @@ public class OrtSession implements AutoCloseable {
       }
     }
 
+    static {
+      try {
+        OnnxRuntime.init();
+      } catch (IOException e) {
+        throw new RuntimeException("Failed to load onnx-runtime library", e);
+      }
+    }
+
     private final long nativeHandle;
 
     private final List<Long> customLibraryHandles;
@@ -1164,6 +1172,14 @@ public class OrtSession implements AutoCloseable {
   /** Used to control logging and termination of a call to {@link OrtSession#run}. */
   public static class RunOptions implements AutoCloseable {
 
+    static {
+      try {
+        OnnxRuntime.init();
+      } catch (IOException e) {
+        throw new RuntimeException("Failed to load onnx-runtime library", e);
+      }
+    }
+
     private final long nativeHandle;
 
     private boolean closed = false;