Add Hysplit data support

[AdamTheisen]

As first documented in #702 , there was interest at the 2023 PI meeting in the ability to read in and work with Hysplit data. We discussed this again on the ACT call and there was interest in this as well from others. It is proposed that we create a simple reader that could read in a file or a url from the web-based hysplit program and convert it to an xarray dataset. The existing PySPLIT repo does not look to be actively maintained.

[rcjackson]

I have some code from OpenCRUMS for reading in HYSPLIT split data with Pandas. I could work with that example dataset for ACT.