Ship graphviz?

[NHDaly]

We should consider shipping graphviz instead of requiring it to be installed. Maybe we can add it to Yggdrasil?

[NHDaly]

I've started work on this, here: https://github.com/JuliaPackaging/Yggdrasil/pull/351

[LilithHafner]

@Keno, are GraphVis.jl or GraphVis_jll appropriate here?

[fingolfin]

There is Graphviz_jll these days:

julia> Graphviz_jll.dot() do exe
         run(`$exe -V`)
       end
dot - graphviz version 2.50.0 (20211204.2007)
Process(`/Users/mhorn/.julia/artifacts/dbc1b7f42ddb07be07d55ad976317ad027618c63/bin/dot -V`, ProcessExited(0))

[fingolfin]

See PR #71