feat: Add basic support for interactions

[ceceppa]

This PR proposes an alternative solution to using Detox.

Proposed solution

When launching the app for OWL testing, we can patch the createElement function of React; this PR is done by calling the initClient method.
This allows us to spy on elements with testIDs and store a reference to their methods, like onPress and onChanged; we can also store a ref to the element that allows us to call methods like: focus, scrollToEnd, etc.

Ideally, the user won't need to add this manually, but we could do it automatically using, for example, a file called index.owl.js where the app will be compiled using this as the entry-point.
In my tests, when calling initClient in the same file of index.js, I couldn't "detect" elements; the createElement was never called for those.

The communication between App and Test happens via the server started on launch. I've added a working example of calling the onPress method for a Pressable component.
This method also allows us to trigger other actions, like: onChangeText, focus and scrollToEnd. It can also be used to get the layout size of a ScrollView, which can be used to get a fullscreen screenshot.

I've also included an example of how we could wait for certain elements to be visible before taking a screenshot.

Some differences with Detox:

• Tap calls the onPress method, even though the element is not in view or is disabled.
• Some manual await might be needed by the users to ensure that the screen has been fully rendered.
• We don't have a way (yet?) to detect if there is some animation going on on the native side

TODO:

• Find a way to launch an index.owl.js without the user needing to call initClient
• Organise code
• Add more interaction methods
• Discuss on improvements
• Setup global teardown for jest to close the client connection