Improving Static Extents and Static Strides Support for Tensor Library

As of right now, static tensor does not support operator +, -, etc because of tensor expression which excepts the same type only and static tensor can be of different types.

```
auto t1 = tensor{static_extents<1,2>{},1.f};
auto t2 = tensor{static_extents<2,3>{}, 1.f};
```
here t1 and t2 are of different type
