Fix #4346: Optimize EmbeddingUtils.toPrimitive(List<Float>)

Auto-cherry-pick to 1.0.x Fixes #4346 Signed-off-by: Waldemar Panas <waldemar.panas@allegro.com>

Author: wpanas

spring-ai-model/src/main/java/org/springframework/ai/model/EmbeddingUtils.java

@@ -39,7 +39,17 @@ public static List<Float> doubleToFloat(final List<Double> doubles) {
 }
 
 public static float[] toPrimitive(List<Float> floats) {
-return toPrimitive(floats.toArray(new Float[floats.size()]));
+if (floats == null) {
+return null;
+}
+if (floats.isEmpty()) {
+return EMPTY_FLOAT_ARRAY;
+}
+final float[] result = new float[floats.size()];
+for (int i = 0; i < result.length; i++) {
+result[i] = floats.get(i);
+}
+return result;
 }
 
 public static float[] toPrimitive(final Float[] array) {