Addition of Rust model

This is to add support for [guillaume-be/rust-bert](https://github.com/guillaume-be/rust-bert), as done for [sshleifer/distilbart-cnn-12-6](https://huggingface.co/sshleifer/distilbart-cnn-12-6/commit/4db2342509916d4799d3e7102f17068bdb62cc4d).

rust_model.ot

@@ -0,0 +1,3 @@
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