Implementing an NCSS Driver

Coming from the MetPy/siphon world and wanting to better integrate my workflows into the Pangeo ecosystem, I'd like to start using intake-thredds to work with TDSs. While it looks like the package currently makes use of opendap and full netcdf file access straightforward, there is nothing yet to handle use of the [NetCDF Subset Service (NCSS)](https://www.unidata.ucar.edu/software/tds/current/reference/NetcdfSubsetServiceReference.html), which is a convenient feature of siphon.

Would there be support for including an NCSS intake driver in intake-thredds? If so, I'd be glad to put together a PR as I work to incorporate intake into my workflows (and understand how intake drivers work in more detail).