Use `cli::cli_abort()` from vroom's C++ code

[jennybc]

We're already using cli::cli_warn() and I've just switched to cli::cli_abort() from the R side. This would be a nice, consistent upgrade re: vroom's errors.

vroom/src/vroom_errors.h

Lines 85 to 105 in f7b9e2d

	void warn_for_errors() const {
	if (!have_warned_ && rows_.size() > 0) {
	have_warned_ = true;
	// it is intentional that we aren't using cpp11::package
	// https://github.com/tidyverse/vroom/commit/984a3e5e37e124feacfec3d184dbeb02eb1145c4
	SEXP cli_ns = Rf_findVarInFrame(R_NamespaceRegistry, Rf_install("cli"));
	PROTECT(cli_ns);
	SEXP cli_warn = Rf_findFun(Rf_install("cli_warn"), cli_ns);
	PROTECT(cli_warn);
	cpp11::strings bullets({
	"w"_nm = "One or more parsing issues, call {.fun problems} on your data frame for details, e.g.:",
	" "_nm = "dat <- vroom(...)",
	" "_nm = "problems(dat)"});
	cpp11::sexp cli_warn_call = Rf_lang3(
	cli_warn,
	bullets,
	Rf_mkString("vroom_parse_issue"));
	Rf_eval(cli_warn_call, R_EmptyEnv);
	UNPROTECT(2);
	}
	}

[jennybc]

See some of the snapshots in #578 for errors that are a bit wonky due to not throwing them with anything as slick as cli::cli_abort().