Not strictly required for anything but soon there will be like 4 new
properties and having it be a huge json just seems like a bad taste.
It also seems right to not have a separate endpoint for this, just
`GetProperties` request that returns a repr of this similar to how
requests are sent in `BatchRequest`.
This will also make a switch to anything other than http much simpler
if it will be required for any reason, like just a tcp stream of
`BatchRequest`s