message: Added mouseDown command with metadata
diff: @@ -389,6 +389,16 @@ export const Commands = [
  target: ArgTypes.conditionalExpression,
  },
  ],
  + [
  + 'mouseDown',
  + {
  + name: 'mouse down',
  + type: TargetTypes.LOCATOR,
  + description: `Simulates a user pressing the left mouse button (without
  + releasing it yet).`,
  + target: ArgTypes.locator,
  + },
  + ],
  [
  'mouseDownAt',
  {
  