Change recordGet to be able to get all records

The API states that the type and name are required, but they are actually can be left out, instead of /v1/domains/{domain}/records/{type}/{name}, you can request either just /v1/domains/{domain}/records or /v1/domains/{domain}/records/{type}

Their docs states that this is the proper usage of the API, but it is too restrictive, because I need a list of all records as won't know what records exists.