Detect borrow error involving sub-slices and suggest `split_at_mut`

```
error[E0499]: cannot borrow `foo` as mutable more than once at a time
  --> $DIR/suggest-split-at-mut.rs:13:18
   |
LL |     let a = &mut foo[..2];
   |                  --- first mutable borrow occurs here
LL |     let b = &mut foo[2..];
   |                  ^^^ second mutable borrow occurs here
LL |     a[0] = 5;
   |     ---- first borrow later used here
   |
   = help: use `.split_at_mut(position)` or similar method to obtain two mutable non-overlapping sub-slices
```

Address most of #58792.

For follow up work, we should emit a structured suggestion for cases where we can identify the exact `let (a, b) = foo.split_at_mut(2);` call that is needed.

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