Adding bound-check function for a better error message

[amitsingh19975]

A bound-checking function takes extents with indices, and then it checks the bound for each dimension that gives more accurate information about the out-of-bound access. The main problem with the current bound-check is that it has no information about dimensions. Therefore, the error you get is not helpful as you don't know which dimension is violated.

  template<integral I1, integral I2, integral ... Is>
  [[nodiscard]] inline reference at (I1 i1, I2 i2, Is ... is)
  {
    ....
    check_bound(_extents, i1,i2,is...);
    ....
  }

  auto t = tensor_dynamic<float>(3,3);
  t.at(0,0) =3.f; // OK
  t.at(3,1) = 4.f; // error: breached ith (=0) dimension
  t.at(2,4) = 4.f; // error: breached ith (=1) dimension