Rough investigation: Open-source solver time and memory penalties

[Olexandr]

Thanks @Antii-L!
Interesting! As far as I remember we ended the project in summer 2018. Julia v1.0 was released in August that year, so before that the API would have been unstable.
This is my first experience with Julia, so I installed the latest version available 2 weeks ago - v1.10.4.
If we decide to proceed further with this we could e.g. decide on the versions of Julia to support and just run automated testing on GitHub to discover any incompatibilities.