New lint `useless-nonzero-new_unchecked` (#13993)

changelog: [`useless-nonzero-new_unchecked`]: new lint

Close #13991

### What it does

Checks for `NonZero*::new_unchecked(<literal>)` being used in a `const`
context.

### Why is this bad?

Using `NonZero*::new_unchecked()` is an `unsafe` function and requires
an `unsafe` context. When used with an
integer literal in a `const` context, `NonZero*::new().unwrap()` will
provide the same result with identical
runtime performances while not requiring `unsafe`.

### Example
```no_run
const PLAYERS: NonZeroUsize = unsafe { NonZeroUsize::new_unchecked(3) };
```
Use instead:
```no_run
const PLAYERS: NonZeroUsize = NonZeroUsize::new(3).unwrap();
```

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