feat: Add _name to distinguish the same flags of different subcomma…

…nds during compile time.

src/cargo/util/command_prelude.rs

@@ -48,6 +48,8 @@ pub mod heading {
 pub trait CommandExt: Sized {
     fn _arg(self, arg: Arg) -> Self;
 
+    fn _name(&self) -> String;
+
     /// Do not use this method, it is only for backwards compatibility.
     /// Use `arg_package_spec_no_all` instead.
     fn arg_package_spec(
@@ -480,6 +482,10 @@ impl CommandExt for Command {
     fn _arg(self, arg: Arg) -> Self {
         self.arg(arg)
     }
+
+    fn _name(&self) -> String {
+        self.get_name().to_string()
+    }
 }
 
 pub fn flag(name: &'static str, help: &'static str) -> Arg {