feat: Turtle.get/set_Steps performance ( Fixes #159 )

Author: StartAutomating

Types/Turtle/get_Steps.ps1

@@ -1,4 +1,8 @@
-if ($this.'.Steps') {
-    return $this.'.Steps'
+if (-not $this.'.Steps') {   
+    $this.psobject.properties.add(
+        [psnoteproperty]::new(
+            '.Steps', [Collections.Generic.List[string]]::new()
+        ), $false
+    )    
 }
-return ,@()
+return ,$this.'.Steps'

Types/Turtle/set_Steps.ps1

@@ -11,4 +11,11 @@ param(
 $Steps
 )
 
-$this |  Add-Member -MemberType NoteProperty -Force -Name '.Steps' -Value @($Steps)
+if (-not $this.'.Steps') {
+    $this |  Add-Member -MemberType NoteProperty -Force -Name '.Steps' -Value @(
+        [Collections.Generic.List[string]]::new($Steps)
+    )
+} else {
+    $this.'.Steps' = $steps
+}
+