Remove crayon::has_color() --> cli::num_ansi_colors() > 1

[MichaelChirico]

rlang/src/rlang/session.c

Lines 28 to 34 in 7371bac

	void r_init_library_session(void) {
	is_installed_call = r_parse("requireNamespace(x, quietly = TRUE)");
	r_preserve(is_installed_call);
	has_colour_call = r_parse("crayon::has_color()");
	r_preserve(has_colour_call);
	}

Related to #1806, {crayon} is only used in two places; this latter looks easy to remove in favor of {cli}.