[feature request] Assist for auto deriving traits if that trait is attempting to be used

Apologies if this has been logged already in some other way, I've read through a few issues but not sure if they're talking about the same thing.

Given the following code:

struct NoDebug {
    num: i32,
}

fn main() {
    let no_db = NoDebug { num: 5 };
    println!("{:?}", no_db);
}

rustc will give compiler error E0277 saying that trait Debug is not implemented for struct NoDebug.

Similarly if we change println!("{:?}", no_db); to println!("{}", no_db); we will get E0277 again but with message trait std::fmt::Display is not implemented for NoDebug.

There are 2 possible fixes, first is to #[derive(Debug)] for the struct, and second is to impl Debug for NoDebug however both of these need to be done manually (although there are other assists to help with generating the impl code already)

It would be good if we could detect what trait impl is missing when we attempt to use the trait, and either derive it automatically on the struct or generate the impl for that trait on the struct then and there.

The issue names no file, test, or entry point, so first identify where rust-analyzer handles missing trait implementations and existing assists for deriving or generating impls. Done means offering an assist when a required trait such as Debug or Display is missing, with generated code or a derive that resolves the diagnostic.