proposal: support autofilling dependency

[MeteorsLiu]

llcppg is hard to analyze the dependency of a clib, however, llpkgstore can retrieve these dependency information from Installer easily.

So i proposal to support autofilling dependency.

llcppg

it's required to add an argument like -deps to allow tools like llpkgstore specifying dependency.

llpkgstore

autofill dependency via -deps when llpkgstore generate llpkgs

[luoliwoshang]

I think this would be a better idea. Supporting the -deps option directly in llcppg would be more suitable than having llpkgstore fetch the llcppg.cfg, parse it, and then add the dependencies. For the user, this would provide a much better experience, eliminating the need to go through the process of finding dependencies, finding the corresponding llpkg, and patching the dependencies field.