Allow automatic parameter lookups to collect metaparameters

There should be a way for automatic parameter lookups to collect metaparmeters for classes.

Given a class, mymodule::testclass I should be able to do something like:

---

mymodule::testclass::require: "Class['mymodule::otherclass']"

and have this be picked up and applied when I do include mymodule::testclass or mymodule::testclass is included in the array being passed to hiera_include()