Handle unexpected AVL IDs in a payload in a better way

[pankalog]

Related to #25

Ideally, should be handled by logging to the user that an AVL ID was not found in the provided parameter map, and that they should figure out what that does.

Then, a new attribute with the AVL ID as its name should be created, and the value type should be ValueType.TEXT. The issue that arises there, is that changing the ValueType of an attribute without deleting the previous attribute, could create some issues down the line. Overthinking? Maybe.