Changes to Lists experiments for a universe.

for the query request parameter maxPageSize, the type changed from string to integer, and format from no format to int32

for the query request parameter skip, the type changed from string to integer, and format from no format to int32

for the query request parameter productTypeFilter, the type was generalized from string to no type

for the query request parameter sortKey, the type was generalized from string to no type

for the query request parameter sortOrder, the type was generalized from string to no type

endpoint added