Improve the signature of internal multirange functions

There is a set of *_internal() functions exposed in
include/utils/multirangetypes.h.  This commit improves the signatures of these
functions in two ways.
 * Add const qualifies where applicable.
 * Replace multirange typecache argument with range typecache argument.
   Multirange typecache was used solely to find the range typecache.  At the
   same time, range typecache is easier for the caller to find.

Author: akorotkov