Centralize method for creating temporary directories

scripts/Windows/Scripts/Context.ps1

@@ -53,4 +53,10 @@ class Context {
             -Wait `
             -NoNewWindow;
     }
+
+    [string] GetTempDirectory() {
+        $tempDir = Join-Path $([System.IO.Path]::GetTempPath()) $([System.IO.Path]::GetRandomFileName());
+        $null = New-Item -ItemType Directory $tempDir;
+        return $tempDir;
+    }
 }