JuliaGraphs_interop: try w/o MetaGraphsNext

[tfiers]

that g[Symbol(a), Symbol(b)] = nothing interface is kinda ew

[tfiers]

It's not much extra load though:

julia> @time using MetaGraphsNext
  1.951201 seconds (3.44 M allocations: 247.719 MiB, 1.53% gc time, 0.91% compilation time: 12% of which was recompilation)

julia> @time using Graphs
  1.501878 seconds (2.36 M allocations: 175.148 MiB)

[tfiers]

https://juliagraphs.org/Graphs.jl/dev/first_steps/construction/
so sth like

g = DiGraph()

# option 1
node_IDs = Dict(pkg => i for (i,pkg) in enumerate(packages))
node(pkg) = node_IDs[pkg]

# option 2
node(pkg) = findfirst(packages, pkg)

for (pkg, dep) in edges
    add_edge!(g, node(pkg), node(dep))
end

…
for i in vertices(g)
	pkg = packages[i]
	…

This is as clean (if not cleaner) and we spare a dep (0.45 second import time on computer; that's more on gh actions)

[tfiers]

(I don't get the point of MetaGraphs; if you can't even do outdegree(g, :Test) (but have to instead do outdegree(g, code_for(g, :Test)). That's literally the same)