Add configuration class for qwen2

Author: orionpapadakis

src/main/java/com/example/model/qwen2/Qwen2Configuration.java

@@ -0,0 +1,37 @@
+package com.example.model.qwen2;
+
+import com.example.model.Configuration;
+
+public record Qwen2Configuration(int dim,
+                                 int hiddenDim,
+                                 int numberOfLayers,
+                                 int numberOfHeads,
+                                 int numberOfKeyValueHeads,
+                                 int numberOfHeadsKey,
+                                 int numberOfHeadsValue,
+                                 int vocabularySize,
+                                 int contextLengthModel,
+                                 int contextLength,
+                                 boolean sharedWeights,
+                                 float rmsNormEps,
+                                 float ropeTheta) implements Configuration {
+    @Override
+    public int headSize() {
+        return dim / numberOfHeads;
+    }
+
+    @Override
+    public int kvDim() {
+        return (dim * numberOfKeyValueHeads) / numberOfHeads;
+    }
+
+    @Override
+    public int kvMul() {
+        throw new UnsupportedOperationException("Not supported for Qwen2.");
+    }
+
+    @Override
+    public int contextLengthModel() {
+        return contextLengthModel;
+    }
+}