refactor: replace ansi_term with nu_ansi_term (#4339)

src/main.rs

@@ -114,7 +114,7 @@ enum Commands {
 fn main() {
     // Configure the current terminal on windows to support ANSI escape sequences.
     #[cfg(windows)]
-    let _ = ansi_term::enable_ansi_support();
+    let _ = nu_ansi_term::enable_ansi_support();
     logger::init();
     init_global_threadpool();