Updating the list of options and sorting it.

fix: local items should not be completed in parent signature

fixes rust-lang#11959

> We get a Bar completion for the following snippet which is wrong as the item is not visible in that position.
> ``` rust
> fn foo() -> $0 {
>    struct Bar;
> }
> ```

I investigated the problem and found that the scope of the cursor offset, also `CompletionContext.scope` is the body of the function

Do not consider `async { (impl IntoFuture).await }` as redundant

changelog: [`redundant_async_block`]: do not trigger on `IntoFuture` instances

Fix rust-lang#11959