loader_deps is confusing

[s-cork]

I think the api is required, but because the non-caching version seemingly behaves differently, it would be worth adjusting.

naming:

• cache_deps
• get_cache_deps
• cache_key
• get_cache_key

I like cache_deps because we will always cache by the path, and then by whatever is returned form cache_deps

By default we could return the query

Route:
    def cache_deps(self, **loader_args):
        return loader_args["query"]

i.e. forms/data are cached by the path and the query by default

And then if you want to override this you can

MyRoute(Route):
    cache_form = True

    def cache_deps(self, **loader_args):
        return None

In this case MyRoute will create a new form instance whenever the query changes

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tagging @daviesian for opinion