Merge branch '9-add-a-new-scord-control-cmake-target' into 'main'

Resolve "Add a new `scord-control` CMake target"

This MR reorganizes the code so that a secondary `scord-ctl` daemon is built. Since a lot of the code is shared between `scord` and `scord-ctl`, it restructures the code structure and the CMake targets so that we can reuse as much as possible. In short, the following changes have been made:

- The source code for the `scord`  daemon now has its own directory in `src/scord`
- A new `scord-ctl` target is added for the new daemon that lives in `src/scord-ctl`
- Library code now lives under the  `lib` directory since `api` seemed ambiguous
- Public rpc definitions now live in `src/lib/rpcs/`
- Private rpc definitions for each daemon now live in `src/scord/rpcs/` and `src/scord-ctl/rpcs/`, respectively
- `config`, `logger`, and `network` code now live under the `common` directory

Closes #9

See merge request !7