Add Llama 3.1 (#98)

* Update Mistral 7B config

* Add Mistral NeMo

* Update for Llama 3.1

* Align LlamaConfiguration with Python implementation

* Fix model configuration names

* Refine DynamicNTKScalingRoPE

* compute base only once

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Co-authored-by: Awni Hannun <awni@apple.com>

Applications/LLMEval/ContentView.swift

@@ -159,7 +159,7 @@ class LLMEvaluator {
 
     /// this controls which model loads -- phi4bit is one of the smaller ones so this will fit on
     /// more devices
-    let modelConfiguration = ModelConfiguration.phi34bit
+    let modelConfiguration = ModelConfiguration.phi3_4bit
 
     /// parameters controlling the output
     let generateParameters = GenerateParameters(temperature: 0.6)