add globals iterators/getters for admin query cmd, improve structure a bit

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/service/admin/query/mod.rs

@@ -3,4 +3,6 @@ pub(crate) mod query;
 
 pub(crate) mod account_data;
 pub(crate) mod appservice;
+pub(crate) mod globals;
 pub(crate) mod presence;
+pub(crate) mod room_alias;