nc::stack, hstack, vstack operates on std::initialier_list<> only.

[TorokLev]

Describe the bug
A clear and concise description of what the bug is.

Due to its definition it is impossible to stack dynamically anything.
So it makes it completely useless

To Reproduce

#include <NumCpp.hpp>
std::list<nc::NdArray> ll;
ll.push_back({10,2,3,4});
nc::hstack(ll); // fails here

Expected behavior
A clear and concise description of what you expected to happen.

not failing.

[dpilger26]

Implemented as part of release version 2.11.0.