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>

src/llama-arch.h

@@ -83,6 +83,7 @@ enum llm_arch {
     LLM_ARCH_ARCEE,
     LLM_ARCH_ERNIE4_5,
     LLM_ARCH_HUNYUAN_MOE,
+    LLM_ARCH_SMOLLM3,
     LLM_ARCH_UNKNOWN,
 };