Format debug trait output

[9prady9]

Code to illustrate the debug output

    let a = randu!(3, 3);
    let b = randu!(3, 3);

    af_print!("a", a);

    println!("a {:?}", &a);
    println!("a {:#?}", &a);
    println!("b {:?}", &b);
    println!("b {:#?}", &b);

Sample Output

a
[3 3 1 1]
    0.6010     0.2126     0.2864 
    0.0278     0.0655     0.3410 
    0.9806     0.5497     0.7509 

a Array { dtype: F32, shape: [3, 3, 1, 1], af_array: 0x560e508ba330 }
a Array {
    dtype: F32,
    shape: [3, 3, 1, 1],
    data: [
        0.6009535,
        0.027758777,
        0.9805506,
        0.21263224,
        0.06546384,
        0.5496738,
        0.28638768,
        0.34101695,
        0.7508749,
    ],
}
b Array { dtype: F32, shape: [3, 3, 1, 1], af_array: 0x560e503c1cb0 }
b Array {
    dtype: F32,
    shape: [3, 3, 1, 1],
    data: [
        0.41050708,
        0.15832818,
        0.3712476,
        0.3543455,
        0.6450288,
        0.9674888,
        0.36364043,
        0.41647816,
        0.5814448,
    ],
}