[FR]: Show capturing environment on hover for async closure

[stormshield-gt]

Currently for async closure when hovering on || it always shows that's it captures nothing even if that is not the case.

Ideally, it should be able to show what it's capturing, like for normal closure.

Rust code

#[tokio::main]
async fn main() {
    let mut count = 0;
    let mut c = async || {
        count += 1;
    };
    c().await;
    dbg!(count);
}