turn this into a monorepo

[CarloLucibello]

We want to host in this repo 2 packages, GNNlib.jl (#432) and GraphNeuralNetworks.jl. In the future there will be another frontend like GraphNeuralNetworks.jl based on Lux.jl.

We want to host all of that into a single repo instead of multiple ones in order to facilitate development, since very likely a PR will often change both GNNlib.jl and the other repo.

Useful discussions on monorepos:
https://discourse.julialang.org/t/anything-to-be-wary-of-when-registering-a-subpackage/112459
https://discourse.julialang.org/t/how-beacon-packages-julia-code-in-a-monorepo/90822/9
JuliaLang/Pkg.jl#3263

An example of monorepo:
https://github.com/gdalle/DifferentiationInterface.jl

[gdalle]

To be fair, I only added the Register action because a user asked for it repeatedly in an issue, but I don't actually use it 😇

[gdalle]

I also havent completely figured out the testing mechanism cause both repos depend on one another for tests. At the moment I think you cannot test DifferentiationInterface if you downloaded it alone, which kinda sucks

[CarloLucibello]

To be fair, I only added the Register action because a user asked for it repeatedly in an issue, but I don't actually use it 😇

I did try but cannot manage to make it work https://github.com/CarloLucibello/GraphNeuralNetworks.jl/actions

[gdalle]

Yeah I had tried that a few times too and hit similar errors that I didn't understand, so I gave up

[CarloLucibello]

For local development instead I found this comment pointing at a solution
JuliaLang/Pkg.jl#3263 (comment)
So I think that instead of deving the packages, one has to clone the repo and try to use this shared manifest trick.
I don't know if julia 1.10 supports it already, probably not.

[gdalle]

Right but my point about local testing is that people should be able to do

using Pkg
Pkg.add("DifferentiationInterface")
Pkg.test("DifferentiationInterface")

and it should just work. Right now it doesn't because my DifferentiationInterface runtests.jl looks for DifferentiationInterfaceTest in the folder next door

[gdalle]

I don't know if julia 1.10 supports it already, probably not.

Doesn't show up on https://pkgdocs.julialang.org/v1.10/toml-files/

[gdalle]

I have figured out a better workflow for mutually dependent tests:

https://github.com/gdalle/DifferentiationInterface.jl/blob/571133f676a2f2ebe70d35f9d779a5aa274dd3ef/DifferentiationInterface/test/runtests.jl#L7-L10

https://github.com/gdalle/DifferentiationInterface.jl/blob/571133f676a2f2ebe70d35f9d779a5aa274dd3ef/DifferentiationInterfaceTest/test/runtests.jl#L8-L11