Collapse the attribute resolver language namespaces

This is more of a question of whether this is a good idea.

In IDP-808 we are collapsing the filter namespaces down to afp:.

I have just remembered that the attribute resolver has similar multiple namespaces, although it is less obvious since each segment has its own namespace (pc, dc, ad, enc).

Do we want to do the same surgery for attribute definition as we are doing for attribute filter (also with the one-off chance to change the language). I'd propose NOT doing this for the pc namespace which is deprecated anyway