Feature request: inline a function

[Nadrieril]

First I want to say this project is absolutely awesome! I didn't know I needed those magic code actions and now I can't live without them ❤️. And it's so fast at spotting my missing semicolons 🤯.

A thing I regularly end up doing when refactoring code is inlining a function that I am in the process of modifying. I'd love a code action that can be triggered on the call site of a function and inlines it at that call site. Might also delete the function if that was the only call site.

fn foo(s: &str, n: u64) {
	println!("A string {}, a squared number {}", s, n*n)
}
fn main() {
	foo|("a string", 1+1)
}

===>

fn main() {
	let n = 1+1; // `n` is a variable here because it's used more than once.
	println!("A string {}, a squared number {}, "a string", n*n)
}