[Feature] Code action to convert misstyped name to actual name

```rescript
let username  = "foo"

let x = usrname
```
the error:
```
Diagnostics:
1. The value usrname can't be found

Hint: Did you mean username?
```
may be we can implement a code action that converts `usrname` to `username` in line 3.

Note that this needs better parsing for diagnostics