`Precision::multiply` overflow

### Describe the bug

In 32bits platforms, `Precision::<usize>::multiply` can quickly overflow, leading to a panic on debug builds.

### To Reproduce

```rust
Precision::Exact(usize::MAX).multiply(&Precision::Exact(2))
```

### Expected behavior

The operation should saturate and `Exact` estimation should become `Inexact`

### Additional context

_No response_