support "dill" for serialization and deserialization

[schlichtanders]

I am using PythonCall to define a Python interface from julia. It happens that I want to precompile Python code using Python's compile function and then send it to a remote process (Distributed).

Unfortunately the default serialize_py and deserialize_py use pickle which cannot handle code objects.

Describe the solution you'd like
It would be perfect if PythonCall had an option to use dill instead of pickle

Describe alternatives you've considered
I am currently overwriting serialize_py and deserialize_py myself to use "dill", and also add "dill" to the CondaPkg.toml.

[cjdoris]

Agreed this would be a nice feature.

[ma-sadeghi]

@schlichtanders Did you figure this out? If so, would appreciate it if you could share the solution. Thanks!

[ma-sadeghi]

I think #454 is related, and will be automatically fixed if dill was an option.

[cjdoris]

This feature is merged to main - you can set JULIA_PYTHONCALL_PICKLE=dill.