Note that even though the sparse runtime support lib always uses SoA
storage for COO storage (and provides correct codegen by means of views
into this storage), in some rare cases we need the true physical SoA
storage as a coordinate buffer. This PR provides that functionality by
means of a (costly) coordinate buffer call.

Since this is currently only used for testing/debugging by means of the
sparse_tensor.print method, this solution is acceptable. If we ever want
a performing version of this, we should truly support AoS storage of COO
in addition to the SoA used right now.

Two constructors could be easily refactored into one after a lot of
previous deprecated code has been removed.

remove some obsoleted APIs from the library that have been fully
replaced with actual direct IR codegen

- Use '\n' instead of std::endl;

https://clang.llvm.org/extra/clang-tidy/checks/performance/avoid-endl.html

The "Dim" prefix is a legacy left-over that no longer makes sense, since
we have a very strict "Dimension" vs. "Level" definition for sparse
tensor types and their storage.

Our CODE and LIB are more unified every day!