Performs right click on a clickable element matched by semantic locator, CSS or XPath.

```js
// right click element with id el
I.rightClick('#el');
// right click link or button with text "Click me"
I.rightClick('Click me');
// right click button with text "Click me" inside .context
I.rightClick('Click me', '.context');
```

@param {CodeceptJS.LocatorOrString} locator clickable element located by CSS|XPath|strict locator.
@param {?CodeceptJS.LocatorOrString} [context=null] (optional, `null` by default) element located by CSS|XPath|strict locator.