Make YAML validator more elegant

[ajjackson]

It seems like there should be a smarter way of doing this...

    def is_valid(loc, typ):
        if (trial := toolz.dicttoolz.get_in(loc.split("/"), file, default=None)) is None:
            raise ValidationError(f"{loc} key is missing.")
        if not isinstance(trial, typ):
            raise ValidationError(f"{loc} should be {typ_.__name__} is {type(trial).__name__}")

    required = {
        'name': str,
        'version': dict,
        ('default_version', 'version/default_version'): str,
    }
    for valid, typ in required.items:
        if isinstance(valid, tuple):
           for tmp in valid:
               with suppress(ValidationError):
                   is_valid(tmp, typ)
                   break
           else:
               raise ValidationError(...)             
        else:
            is_valid(valid, typ)

Or similar?

Originally posted by @oerc0122 in #19 (comment)

Various more elegant alternatives were considered. My current leaning is towards json-schema.

[ajjackson]

I note that aiida-mlip is using the "voluptuous" package, maybe that's another one to consider. https://pypi.org/project/voluptuous/