Create H5->Dict and Dict->H5 Oneliners

[eloise-nebula]

Standardize H5 read/write.
Pykern has some good IO tools we could look to as a template.

https://github.com/radiasoft/pykern/blob/a331d152ca41e29a215b69f4c410fbb85d9fe712/pykern/pkio.py#L372-L391