Array Init Macro

Provides a simple macro to initialize an array given a type, size and value.

```rust use arrayinitmacro::arr;

fn main() { // [1, 1, 1, 1] let array0 = arr![u8; 4; 1];

// [1, 1, 1, 1]
let array1 = arr![u32; 4; 1];

// [Vec[1, 2], Vec[1, 2], Vec[1, 2], Vec[1, 2]]
let array2 = arr![Vec<u8>; 4; vec![1, 2]];

} ```