Rename on an imported type should rename the import to an alias.

I'm not sure if this is valid request, but please feel free to close it, if it is.

When I tried to rename an imported type, hoping it will rename it to an alias, but it just returned an error: "Can't rename non-local definition". But when I searched, I found that rename will alias an import, if we are in the use tree when invoking it, so I was wondering if we could extend to any imported type or the at least non-local crate imports?

Simple example:

use std::collections::HashMap

struct Foo {
	map: HashMap$0,
}

Invoking rename on the cursor should create an alias import:

use std::collections::HashMap as StdHashMap;

struct Foo {
	map: StdHashMap$0,
}