proposal: merge package manager into the nature command

[arjendevos]

Currently the package manager is written in Go and is being used with a different command. I think we can integrate it into the nature binary which would make it way easier to use.

Some example commands:

nature pkg sync
nature pkg init // New: scaffold a package.toml with default values
nature pkg add <dep> --version v1.0.0 // New: add a dependency

// Future addition
- nature pkg remove <dep> // New: remove a dependency
- package.lock file?

I recognize that the current way of handling packages is probably not the final setup as there is no separation per project which means removing/cleaning up packages can have an impact on other projects. Thus this issue also serves as a discussion on how to improve the package manager.

[weiwenhao]

Package management needs a lot of improvements, and it is indeed only a demo version at the moment. nature pkg looks good. package.lock seems to be necessary, but I haven’t fully understood and researched how to design a suitable package management tool.