Add training with similar data to paper

[jacobbieker]

Detailed Description

MetNet was trained on GOES and MRMS data, and MetNet-2 on that plus some NWP initialization parameters. All that data is publicly accessible with no restrictions from NOAA, so adding that to HF datasets to make it easy to ideally, reproduce the paper would be great.

Context

This would add GOES-16/17 and MRMS precipitation data to HF Datasets, along with probably the HRRR NWP model for high-resolution data over the US. The data for GOES and HRRR is all available through Amazon open datasets, while the MRMS data has been archived and is fairly easily accessible.

Possible Implementation