add rwkv encoder

aky15

2023-10-20 ab653d3871f72f7f6cd1ac3126b3df722f4c7943

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<?xml version="1.0" encoding="UTF-8"?>
<Bucket
   uuid = "A434E096-73C6-4C03-86F5-FAA8A72D79B0"
   type = "1"
   version = "2.0">
</Bucket>