Use cli errors

[EmilHvitfeldt]

Ref: tidymodels/rsample#457

Most or all errors thrown in this package are made via rlang::abort(). We are transitioning to cli::cli_abort() to make use of the richer styling options for errors via cli (which calls rlang under the hood).

These are the following "counts":

$ package    <chr> "tune"
$ cli_abort  <int> 33
$ cli_warn   <int> 14
$ cli_inform <int> 2
$ abort      <int> 116
$ warn       <int> 13
$ inform     <int> 0
$ stop       <int> 0
$ warning    <int> 5
$ message    <int> 10

I have a feeling we won't be able to convert all message() uses as they are more integral to how the logging works. Which is fine.

This issue is deliberitely not a tidy-dev-day issue because of the way we use exit handlers to catch and rethrow most errors.