Add a tool to describe *all* hydration methods?

[camsaul]

We do get https://github.com/camsaul/methodical#debugging for free, but you'd still have to look at the docstrings for simple-hydrate, batched-hydrate, and automagic-batched-hydrate (?) to really see all the hydration methods that exist. Maybe a unified method for debugging that could list everything would be nice? Or are the existing debugging facilities sufficient.

Bonus points: if we could have these methods automatically update the docstring for hydrate that would be neat! Maybe we would need something like camsaul/methodical#108