Calling `assessment()` on a `permutations` gives a confusing error

[mikemahoney218]

Related: I am now seeing that the error thrown when calling assessment() on a permutations object is not correct:

library(rsample)

p <- permutations(mtcars, cyl)

assessment(p$splits[[1]])
#> Error in `as.data.frame()`:
#> ! There is no assessment data set for an `rsplit` object with class `rsplit`.

It should read something like:

#> ! There is no assessment data set for an rsplit object from a permutations set.

Or something along those lines...

Originally posted by @mattwarkentin in #319 (comment)

[juliasilge]

We also do need to add permutations() to the vctrs compatibility files. I think it should just act like other rsets? In terms of binding rows/columns? Worth a little thought, though.

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