feat: Namespace.get_Variable ( Fixes #1144 )

Types/Namespace/get_Variable.ps1

@@ -0,0 +1,19 @@
+<#
+.SYNOPSIS
+    Gets the variables in the namespace.
+.DESCRIPTION
+    Gets all the variables in the namespace.
+
+    These are all the variables where the name matches the pattern of the namespace, 
+    or the `.Value.pstypenames` match the pattern of the namespace.
+#>
+
+foreach ($variable in Get-ChildItem variable:) {
+    if ($variable.Name -in 'this','_') { return }
+    if ($variable.Name -match $this.Pattern) {
+        $variable
+    }
+    elseif ($variable.value.pstypenames -match $this.Pattern) {
+        $variable
+    }
+}