Better error message when using range argument wrong

[EmilHvitfeldt]

The following error was extracted from https://stackoverflow.com/questions/72619333/error-range-must-have-an-upper-and-lower-bound-inf-and-unknown-are-acceptabl.

If you pass a range of numbers into range you get the following message which at first glance suggests Inf or unknown() is at fault

library(dials)
trees(range = c(100, 2000, by = 100))
#> Error in `range_validate()`:
#> ! `range` must have an upper and lower bound. `Inf` and `unknown()` are acceptable values.

[hfrick]

closed in #260

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