qcs-sdk-python should take over the qcs PyPI package

[MarquessV]

We own the qcs package on PyPI, but don't use it for anything useful. The package is easily mistaken for qcs-sdk-python since the Rust library is itself called qcs. We should repurpose the qcs package as a home for qcs-sdk-python.

One future issue: qcs currently has one release, 2.1.0. PyPI doesn't let you replace the package behind a version, even if you delete it. This means we'll run into an issue uploading the package to PyPI if the QCS library ever reaches 2.1.0.