Force valid indentifier for anything that called format_to_valid_identifier

[nicopop]

Since I have seen some people that still get identifier errors while using options, im making this PR to force the options names to be valid as python detects it

reminder that option display_name stays to whatever invalid name they defined in options.json/category.json this function just make sure its valid as a key

[nicopop]

Ill probably need to add support for accented characters since those appear to be valid for identifiers.
A slightly disgusting fix could be to check each non numeric char in the string through str.isidentifier()

[nicopop]

I tested and using str.isidentifier() against every character is actually pretty free (on the ms taken side)
it might start to influence timing if devs try to use really long options names but if they make sure its already valid then the first check skip all the rest of the code

[nicopop]

here's what I used to test the timing:

+ a call in hooks/world.py: after_fill_slot_data logging.info(f"identifier conversion took {get_valid_ident_timing():.4f} seconds total")
at worst I got a 0.0035 seconds but its usually around 0.0010
if we want to reduce the time spent even more we could slap a @cache (from functools) on it and then the average is smaller than 0.0000 seconds
but at this point I think its fast enough and compatible with as many character we can

[silasary]

Yeah, I don't think it gets called enough to justify @cache usage