Also add in optional visualization inputs as default to ensure that
they are in the environment when used at runtime.
Some hacks to avoid packaging retworkx (uses a semi-complicated Rust ->
Python packaging system, will try to get that packaged in future).
For now, just disabling retworkx, will need to package it in future.
Qiskit is a quantum information toolkit from IBM. This commit
follows the new Qiskit scheme of breaking from one large package into
smaller packages (terra, aer, etc), and then having a single
meta-package "qiskit" that comprises them.
