Changes to List monitors

the endpoint scheme security BearerAuth was added to the API

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

added subschema #3: ICMP protocol to the data/items/request response property oneOf list for the response status 200

added the new icmp enum value to the data/items/protocol response property for the response status 200

added the new optional query request parameter tag

added the non-success response with the status 422

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

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