[Thread] add ThreadNetworkController APIs

The ThreadNetworkController class provides APIs for managing the Thread
network, for example, attach to a specific network, form a network with
given dataset or update/migrate an existing network.

Bug: 262683651
Test: atest CtsThreadNetworkTestCases
Change-Id: Ib3c267d2c81a8c3c7772ed3c9cd2092487cc941a
diff --git a/thread/service/jni/onload.cpp b/thread/service/jni/onload.cpp
new file mode 100644
index 0000000..5081664
--- /dev/null
+++ b/thread/service/jni/onload.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jni.h"
+#include "utils/Log.h"
+
+namespace android {
+int register_com_android_server_thread_TunInterfaceController(JNIEnv* env);
+}
+
+using namespace android;
+
+extern "C" jint JNI_OnLoad(JavaVM* vm, void* /* reserved */) {
+    JNIEnv* env = NULL;
+
+    if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
+        ALOGE("GetEnv failed!");
+        return -1;
+    }
+    ALOG_ASSERT(env != NULL, "Could not retrieve the env!");
+
+    register_com_android_server_thread_TunInterfaceController(env);
+    return JNI_VERSION_1_4;
+}