Exposing the canonicalization code in the luafilter allows it to be used
on the Lua side of things. This should enable some pretty cool stuff to be
done with it.
The luafilter exposes two of the main functions provided by the query
classifier API; the type and operation classification.
The functions can be used by the Lua script with minimal overhead as the
current query being executed is stored only as a pointer. The functions
should only be called inside the `routeQuery` entry point of a Lua script.
