Implement dependency analysis sub command

[pablochacin]

Once the dependency analysis logic is integrated into k6 it will no longer be needed in k6deps, which likely will become an internal package of k6 with a limited functionality of resolving the version constraints for the dependencies.

However, k6deps is still used in some GCK6 processes, as a library as a CLI tool.

It will therefore be convenient to offer this functionality as a k6 subcommand returning the dependencies in the same format as k6deps does.

To replicate the functionality of k6deps CLI, this subcommand requires support for the dependency manifest implemented in k6.