Changes to List Activity Custom Fields

for the query request parameter _limit, default value was changed from 100 to 1000

for the query request parameter _limit, the max was set to 1000.00

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

removed the non-success response with the status 404