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Feature: Add assist to unwrap tuple declarations

> Implement #12923 for only tuples.
>
> Does not implement unwrapping for structs, as mentioned in the issue.

Add assist to unwrap tuples declarations to separate declarations.

```rust
fn main() {
	$0let (foo, bar, baz) = (1.0, "example", String::new())
}
```

becomes:

```rust
fn main() {
	let foo = 1.0;
	let bar = "example";
	let baz = String::new();
}
```

## Changelog

### Feature

- Added assist to unwrap tuple declarations.
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rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.

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