Add Fixed Shape and Layout tensors to the CPP version

At present, the shape and the layout of tensors are always a runtime value, this limits the ability of the compiler to reason about how best to optimize the object code. By having the ability to make the shape and layout compile time using tensors the compiler has increased opportunities to produce optimized output.

The approach taken is to create two shape and layout types.

TTL_shape behaves exactly as today with the the sizes passed at construction for example.

TTL_shape a_shape(10, 20, 30);

TTL_shape_const has the parameters passed at compile time as template parameters.

TTL_shape_const<10, 20, 30> a_const_shape;

The same method is used for TTL_layout[_const].

Once generated, the const/var versions are interchangeable because templates are used in the shape/layout consumers.

This duck-typing method allows the methods consuming the const/var versions to themselves be compile time optimizable.