Add compatibility check for run-time dependencies of injected packages

[delsner]

If one injects a package using --inject, the package's run dependencies might not be compatible with the dependencies in the packed environment. The cause could be that one does not update the run dependencies in the conda/rattler recipe when updating the pixi.lock file for the packed environment.
A nice feature would be to check for compatibility during "pack-time", s.t. users are not injecting packages with incompatible run dependencies.