Changes to List or filter all Custom Activity instances

added the pattern property ^custom\.(cf|lcf|ccf|acf|gcf|scf)_[A-Za-z0-9]+$ to the data/items response property for the status 200

for the query request parameter _limit, the max was set to 100.00

for the query request parameter _skip, the max was set to 250000.00

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

added the optional property data/items/created_by_agent_id to the response with the 200 status

added the optional property data/items/updated_by_agent_id to the response with the 200 status

added the new optional query request parameter _fields