Add x and y axis/sequences in order to provide ability for custom x and y ticks

Author: Max Streese

core/shared/src/main/scala/plotly/Trace.scala

@@ -237,18 +237,24 @@ object Histogram {
 }
 
 @data class Surface(
+          x: Option[Sequence],
+          y: Option[Sequence],
           z: Option[Sequence],
   showscale: Option[Boolean],
     opacity: Option[Double]
 ) extends Trace
 
 object Surface {
   def apply(
+            x: Sequence  = null,
+            y: Sequence  = null,
             z: Sequence  = null,
     showscale: JBoolean  = null,
       opacity: JDouble   = null
   ): Surface =
     Surface(
+      Option(x),
+      Option(y),
       Option(z),
       Option(showscale) .map(b => b: Boolean),
       Option(opacity)   .map(d => d: Double)