Add "wait" feature

[CodeWithCory]

Add an option to wait for a specific element to appear:

Action string example: 'wait .popup'

Full example:

  spaCheck([
    'click button',
    'wait .popup',
    'click .new-button',
  ]);

Should probably have a default max time to wait, perhaps add a 3rd string param override the default.

[CodeWithCory]

Done as of 3.0.0, added the override as an option in the config