[5.x] Ability to override how objects are serialized

[duncanmcclean]

This pull request introduces a formatForTelescope method, allowing developers to override how Telescope formats/serializes their objects.

By default, Telescope uses json_decode(json_encode($object), true) to format/serialize objects, which takes the object's properties and attempts to JSON serialize them.

However, in our case, where ->jsonSerialize() may return objects which reference the current object, that isn't ideal as it causes an infinite loop.

Instead, we'd like to take control of the serialization logic and return an array without any of the "circular relationships".

Related: statamic/cms#10782