Deprecate and rename hook_objects to hook_factories

[aaraney]

ngen-cal/python/ngen_config_gen/src/ngen/config_gen/generate.py

Line 37 in 0260868

hook_objects: Collection[BuilderVisitableFn],

Add deprecation warning if hook_objects is used.

I think it’s worth easing future pain by modifying the api to be keyword only too. To my knowledge all uses of this function specify arguments as keywords. I’ll do more investigating before making this breaking change.