Julia server support

[sverhoeven]

The next generation of the Wflow hydrological model is being created at https://github.com/Deltares/Wflow.jl . As you can see from the name it is written in Julia. It has a BMI.

It would be nice if grpc4bmi can be used to interact with the BMI of Wflow.jl.

Things to do

1. Find a gRPC server implementation that is written in Julia or can call Jullia code
2. Wrap Wflow.jl into a Docker image with a grpc server as entrypoint

[sverhoeven]

Could use a generic version of https://github.com/eWaterCycle/pywflow/blob/main/pywflow/wflow.py

[sverhoeven]

And use https://pypi.org/project/juliacall/ to call Julia methods from Python.

[sverhoeven]

pip install grpc4bmi[julia] would install juliacall.