Add audit flag to clusters get

There is audit data (createdBy, createdAt, ...) that is returned from the v4 API when we get a cluster. Currently there is no way to see this data when using the shell. We should add an audit flag, similar to the one we have in projects. However with projects we add each field of the audit data to the output, here we should have a nested `audit` that contains all the audit info. 