model : add SmolLM3 (#14581)

* Init - first pass.

* Model -> ModelBase.

* fix errors in conversion.

* Update the graph.

* up.

* up.

* wip

* cgraph ok

* rm redundant code

---------

Co-authored-by: Vaibhavs10 <vaibhavs10@gmail.com>

convert_hf_to_gguf.py

@@ -6687,6 +6687,11 @@ class HunYuanMoEModel(TextModel):
             if len(experts) > 0:
                 raise ValueError(f"Unprocessed experts: {experts}")
 
+
+@ModelBase.register("SmolLM3ForCausalLM")
+class SmolLM3Model(LlamaModel):
+    model_arch = gguf.MODEL_ARCH.SMOLLM3
+
 ###### CONVERSION LOGIC ######