feat: Add a new config to allow renaming of non-local defs

[alibektas]

With #15656 we started disallowing renaming of non-local items. Although this makes sense there are some false positives that impacted users' workflows. So this config aims to mitigate this by giving users the liberty to disable this feature.

The reason why this is a draft is that I saw one of the tests fail and I am not sure if the "got" result even syntactically makes sense

Test case is :

check(
            "Baz",
            r#"
//- /lib.rs crate:lib new_source_root:library
pub struct S;
//- /main.rs crate:main deps:lib new_source_root:local
use lib::S$0;
"#,
            "use lib::Baz;"
);

Left:
use lib::Baz;

Right:
use lib::Baz;Baz

Diff:
use lib::Baz;Baz

[Veykril]

The test runner was not aware of renames affecting multiple files so it just concatenated the changes. I fixed that and pushed it to your branch.

[Veykril]

@bors r+

[bors]

📌 Commit 2102091 has been approved by Veykril

It is now in the queue for this repository.

[bors]

⌛ Testing commit 2102091 with merge a5b89ff...

[bors]

☀️ Test successful - checks-actions
Approved by: Veykril
Pushing a5b89ff to master...