Controling arg recursive passed to tools::package_dependencies()

[courtiol]

When using makeDepGraph() it would be nice to be able to prevent recursion on dependencies.
That would lead to plots easier to read for packages with a lot of dependencies.
I will attempt a PR.

[andrie]

I commented in the PR too:

I suspect the better way to do this is to compute on the dependency graph itself, rather than to limit recursion.

In igraph you can compute the shortest distance to a node: https://r.igraph.org/reference/distances.html?q=distance#null

It should then be possible to remove all nodes with a distance greater than n.