debuginfo: ensure named types are package prefixed

[flga]

This allows debug scripts/debuggers to do proper type lookups.
Lots of whitespace :(

[gingerBill]

I think the reason this was not done originally is because you cannot refer to that type due to the .. It might have to be pkg::name instead to match C++.

[flga]

@gingerBill types are already declared in pkg.type form, just not consistently. Hence the change, I bumped into this while inspecting enum array debug info.

I'm not sure under which contexts it wouldn't work, but at least both lldb and gdb don't complain (DWARF).

Just wanted to clarify that if we want to move away from it we need to also change current logic even if we drop this change.

Sidenote: Go goes as far as including the full package path. I pondered putting that forward but that seemed like a big change and it really only matters for programs with duplicate package names so I figured I'd keep it simple for now and focus on the inconsistency. Irrelevant, package names are enforced to be unique as pointed out by Lperlind.

[Lperlind]

You can't have duplicate package names in Odin so that sidenote won't be a problem

[flga]

Ah, you are right, I assumed that if they had different roots it would be fine. Thanks!

[laytan]

Note that this function is also used for some error messages and probably other things.
(just a note, I don't know if we want that or not)