Consider the possibility to use [T] instead of Vec<T> in trait Array

### I'm submitting a 
- [x] exploratory

### Current Behaviour:
all `smartcore::linalg::basic:arrays` are implemented for Vec<T>:
```
impl<T: Debug + Display + Copy + Sized> Array<T, usize> for Vec<T>
```

### Expected Behaviour:
Try to consider the possibility of implementing arrays for slices:
```
impl<T: Debug + Display + Copy + Sized> Array<T, usize> for [T]
```