Write helper scripts related to name resolution

[kelle]

There are many functions that should be checking for name resolvabilty using something like Sesame. We should build some generic functions in utils or find a relevant python package.

[kelle]

As far as i can tell, this is the astropy utility which we can use instead of rolling our own: https://docs.astropy.org/en/stable/_modules/astropy/coordinates/name_resolve.html