Derive clone and debug traits for Moondream model (#2100)

* moondream implementation

* add moondream example

* change config default activation

* Add assets and integrate phi mixformer with example

* Make use of kv cache and fix seq_len bug; Clean up example code

* Add README link to example

* Remove pos_embed scaling; Remove assets; Add to README; Expand VisionConfig

* Delete image

* Use apply instead of forward

* Use latest release special token; Fix token/s accuracy; Use GeluPytorchTanh in VisionConfig v2

* Derive debug and clone traits for Moondream model.

candle-transformers/src/models/moondream.rs

@@ -302,6 +302,7 @@ impl Module for VisionEncoder {
     }
 }
 
+#[derive(Debug, Clone)]
 pub struct Model {
     pub text_model: PhiModel,
     pub vision_encoder: VisionEncoder,