Function Java_com_torsh_Tensor_nativeAdd 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn Java_com_torsh_Tensor_nativeAdd(
    _env: JNIEnv,
    _class: jclass,
    a_handle: jlong,
    b_handle: jlong,
) -> jlong

JNI function to add two tensors