Create a List object that is more efficient and reduces bugs

[ktofu]

At the moment, lists can only be validated all at once. In cases where there are millions of items in the list, this could be too expensive.

An Encodium List object should inherit from list, but automatically validate individual items when they are appended (and check constraints such as max_length, etc).

Furthermore, if you append something to a primitive list, the encodium check_ functions will not be triggered, and must be called manually (hence why implementing this would reduce bugs)