Adds cli_abort to R/misc.R

[Dpananos]

Closes #509

As with a few other of my PRs, the tests are going to fail because I've implemented pluralization.

For example, one of the calls to rlang::abort wrote `"class(es)" and so my tests fail since some of the tests trigger the singular cases. See below

── Failure (test-misc.R:176:3): get_rsplit() ───────────────────────────────────
Snapshot of code has changed:
    old                                                          | new                                                         
[2]   get_rsplit(warpbreaks, 1)                                  |   get_rsplit(warpbreaks, 1)                              [2]
[3] Condition                                                    | Condition                                                [3]
[4]   Error in `get_rsplit()`:                                   |   Error in `get_rsplit()`:                               [4]
[5]   ! No `get_rsplit()` method for this class(es) 'data.frame' -   ! No `get_rsplit()` method for this class 'data.frame' [5]

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