fix: offer promote-local-to-const in macro call and proc macro

[eihqnh]

change

1. support promote local to const inside macro expansions
2. add record field shorthand macro boundary guard
3. add two new tests
4. change some code style

example

 #[tokio::main]
 async fn main() {
//ide-assist promote local to const is not working
    let x$0 = 0; 
    let _ = x;
}

//after
const X: i32 = 0;
let _ = X; 

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.