test(configurate): add test for alternate property format

Author: Emilxyz

serializer-configurate4/src/test/java/net/kyori/adventure/serializer/configurate4/ComponentSerializerTest.java

@@ -273,4 +273,19 @@ void testPlayerProperties() {
     );
   }
 
+  @Test
+  void testPlayerMapPropertyFormat() {
+    assertEquals(
+      Component.object(ObjectContents.playerHead()
+        .profileProperty("textures", "cool_value")
+        .build()),
+      this.deserialize(this.node(n -> {
+        final BasicConfigurationNode textures = n.node(ComponentTreeConstants.OBJECT_PLAYER)
+          .node(ComponentTreeConstants.OBJECT_PLAYER_PROPERTIES)
+          .node("textures");
+        textures.appendListNode().raw("cool_value");
+        textures.appendListNode().raw("cooler_value");
+      }))
+    );
+  }
 }