Fixed concurrent vertices access

Author: emyfops

src/main/kotlin/com/lambda/graphics/pipeline/VertexBuilder.kt

@@ -29,8 +29,8 @@ import org.joml.Vector4d
 class VertexBuilder(
     private val direct: VertexPipeline? = null
 ) {
-    val vertices by lazy { mutableListOf<Attribute>() }
-    val indices by lazy { mutableListOf<Int>() }
+    val vertices by lazy(LazyThreadSafetyMode.PUBLICATION) { mutableListOf<Attribute>() }
+    val indices by lazy(LazyThreadSafetyMode.PUBLICATION) { mutableListOf<Int>() }
 
     private var verticesCounter = 0