[neurun] Allow integer list for neurun::operand::Shape (#4909)

[neurun] Allow integer list for neurun::operand::Shape (#4909)

This patch enables initilization of neurun::operand::Shape with list.

Before:
```
    operand::Shape shape{4};
    shape.dim(0) = 1;
    shape.dim(1) = 2;
    shape.dim(2) = 2;
    shape.dim(3) = 1;
```

After:
```
    operand::Shape shape{1, 2, 2, 1};
```

Signed-off-by: Sanggyu Lee <sg5.lee@samsung.com>