CLI tooling

We currently have a CLI build at part of the repo, but we don't ship it. Long term, do we need some type of CLI support?

Note that this could be a simple as a CLI added to the environment by "pip install qsharp" (e.g. ).

Imagining for now a CLI named `qsharp`, perhaps this could contain subcommands such as `qsharp compile ...`, `qsharp run ...`, `qsharp test ...`, etc.

This would also be useful for Copilot to run commands in agent mode in editors or repo bots (e.g. to run simulations and/or verify changes).