kotlin impl, avoid message passing overhead

mobile/android/app/src/main/cpp/native_buffer.c

@@ -0,0 +1,13 @@
+#include <jni.h>
+
+JNIEXPORT jobject JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_00024Companion_wrapPointer(
+    JNIEnv *env, jclass clazz, jlong address, jint capacity) {
+    return (*env)->NewDirectByteBuffer(env, (void*)address, capacity);
+}
+
+JNIEXPORT jobject JNICALL
+Java_app_alextran_immich_images_ThumbnailsImpl_wrapPointer(
+    JNIEnv *env, jclass clazz, jlong address, jint capacity) {
+    return (*env)->NewDirectByteBuffer(env, (void*)address, capacity);
+}