Used to register classes as Load helpers
When decorating a class the parameter is the class of "handle type", i.e.
a ButlerURI type or open file handle that will be used to do the loading.
This is then associated with the decorated class such that when the
parameter type is used to load data, the appropriate helper to work with
that data type can be returned.
A decorator is used so that in theory someone could define another handler
in a different module and register it for use.
Parameters
----------
URIClass : Type of `~lsst.daf.butler.ButlerURI` or `~io.IO` of bytes
type for which the decorated class should be mapped to
Definition at line 56 of file _loadHelpers.py.