New axe checking function and vignette for models that are "minimally sufficient"

[jyuu]

Going forward, new model objects should not (or mostly should not) require axing, esp for those built with the hardhat package. Consider putting together a modeling package using hardhat and developing some function that checks whether axe methods are needed from new model object output. If axe functions are needed, user should be able to import butcher and develop their own set of axe methods (see development of broom and how it is handled there)

[jyuu]

Note there are some older modeling packages that won't change, so axe methods for those should still exist

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