girepository: Also store GType cache misses

There are notably 4 classes of GTypes where a girepository lookup
might fail:
- GTypes from private interfaces in public objects (eg. MetaCullable in
  mutter)
- GTypes for private base objects with public interfaces (eg. GLocalFile
  in GLib)
- GTypes registered from the language, and presumably not coming from the
  GIR
- GTypes of objects/interfaces that we didn't load a typelib for

It is moot to look for those over and over again, and a full lookup can
be taxing if looking up for a method/property on objects with those
characteristics.

It seems we can cache the misses too, so next lookups are just as quick
as an introspected GType. The cache is invalidated after loading new
typelibs, in case some of the previously missed GTypes is now properly
introspected.

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