Migrate crayon::has_color() -> cli::num_ansi_colors()>1 (#1809)

Closes #1808

Author: MichaelChirico

src/rlang/session.c

@@ -15,7 +15,7 @@ bool r_is_installed(const char* pkg) {
 static r_obj* has_colour_call = NULL;
 
 bool r_has_colour(void) {
-    if (!r_is_installed("crayon")) {
+    if (!r_is_installed("cli")) {
         return false;
     }
 
@@ -26,7 +26,7 @@ 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()");
+    has_colour_call = r_parse("cli::num_ansi_colors() > 1L");
     r_preserve(has_colour_call);
 }