Improve external quoting logic (#3579)

* Add tests and improve quoting logic

* fmt

* Fix clippy ling

* Fix clippy ling

crates/nu-command/src/utils/test_bins.rs

@@ -25,6 +25,15 @@ pub fn cococo() {
     }
 }
 
+pub fn meow() {
+    let args: Vec<String> = args();
+
+    for arg in args.iter().skip(1) {
+        let contents = std::fs::read_to_string(arg).expect("Expected a filepath");
+        println!("{}", contents);
+    }
+}
+
 pub fn nonu() {
     args().iter().skip(1).for_each(|arg| print!("{}", arg));
 }