This is mainly for security reasons. This way, we can limit the
permissions of wpexec without limiting wireplumber, for instance
with pipewire's default module-access, which limits apps based on
their executable name
Add the ability to construct an Interest argument without
using the Interest keyword, so instead of:
om:lookup(Interest { type = "session" })
we can now write:
om:lookup { type = "session" }
... and also remove lookup_filtered from ObjectManager
