Changes to Retrieve Custom Feeds

added the new optional query request parameter filter[has_connected_list]

added the new enum value connected_list to the query request parameter include

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

added the optional property errors/items/source to the response with the 400 status

added the optional property errors/items/source to the response with the 401 status

added the optional property errors/items/source to the response with the 403 status

added the optional property errors/items/source to the response with the 429 status

added the optional property errors/items/source to the response with the 500 status

added the optional property errors/items/source to the response with the 504 status

the endpoint scheme security ApiKeyAuth was added to the API

the endpoint scheme security OAuth2 was added to the API

added the non-success response with the status 401