Allow multiple attribute dictionaries

[gazpachoking]

I liked the idea in my other thread about datastar of a helper to create the attribute dictionary. #105 (comment) I went all out with this, to get extra type checking and ide autocomplete for datastar attirbutes in a way that can be useful with this library and others. starfederation/datastar#902

The issue I'm having, is with this method, what's the nicest way to include multiple such attributes? Right now I think the union operator is probably the best option, e.g. div(helperdict()|otherhelperdict()) (Which I actually didn't think of until writing this, and isn't terrible.) My other idea was just to allow any number of attribute dicts, to enable div(helperdict(), helperdict()) style. Does that seem reasonable or useful? I can write up a PR if so.

[gazpachoking]

Should be fairly simple to support, put up a draft #117