parler-tts support (#2431)

* Start sketching parler-tts support.

* Implement the attention.

* Add the example code.

* Fix the example.

* Add the description + t5 encode it.

* More of the parler forward pass.

* Fix the positional embeddings.

* Support random sampling in generation.

* Handle EOS.

* Add the python decoder.

* Proper causality mask.

candle-transformers/src/models/mod.rs

@@ -40,6 +40,7 @@ pub mod mobileone;
 pub mod moondream;
 pub mod mpt;
 pub mod olmo;
+pub mod parler_tts;
 pub mod persimmon;
 pub mod phi;
 pub mod phi3;