Implement generating thin-edge binariespost-merge/nix-thin-edge-builder

The flake now exports a working `lib.mkThinEdge` function with which
users can generate a working binary with only the components they wish
to include.

It works as follows:

- It pulls in all the dependencies required for the thin-edge CLI
- It then pulls in and patches the sources given. Any path references to
  tedge_api/lib are patched to their nix-store equivalencies.
- The Cargo.lock is generated by downloading the cargo index and
  overriding its location to be effectively offline
- A temporary Rust project is created, where all the different
  components are then referenced and pulled in.
- This Rust project is then compiled using `crane` (currently a private
  fork with some hacks due to a deficiency in Nix relating to importing
  store paths in the TOML reader)
- crane automatically copies the resulting binary to the output

Signed-off-by: Marcel Müller <m.mueller@ifm.com>

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