Cut + CutPrefix + CutSuffix for slices

Something similar to `strings` package.

```go
func Cut[T any, S ~[]T](s S, sep T) (before S, after S, found bool)
func CutPrefix[T any, S ~[]T](s S, suffix T) (after S, found bool)
func CutSuffix[T any, S ~[]T](s S, suffix T) (before S, found bool)
```
