Code Fails on Import if Internet Connection is Disrupted

[Mjvolk3]

Describe the bug
If there is a a break in internet connection programs fail on import of HyperNetX

To Reproduce
Steps to reproduce the behavior:

1. Disconnect from internet
2. Try to import

Expected behavior
Program fails because attempted schema download

schema_url = "https://raw.githubusercontent.com/pszufe/HIF_validators/main/schemas/hif_schema_v0.1.0.json"

https://github.com/pnnl/HyperNetX/blob/c1812a9211040fee4186df23669b05dcfe90d020/hypernetx/hif.py#L12C1-L12C107

Environment (please complete the following information):

• OS independent

Additional context
I have fixed this locally by commenting out the import of of hif.py locally... But this will likely disturb other files. I would think that you could put the schema in the package via Manifest.

https://github.com/Mjvolk3/HyperNetX/blob/c1812a9211040fee4186df23669b05dcfe90d020/hypernetx/__init__.py#L6