[Feature Request] Support for PyCall's PyVector, PyArray, PyDict etc.

PyCall allows Julia to call Python code without copying objects from Julia to Python - e.g. you can create a dict or an array in Julia and pass it to Python with no copy.

`pyjulia`, instead, cannot do this. I would like to help, but I'm very new to Julia. If you could explain to me how the code is designed in `pyjulia` and point me in the right direction, I would be happy to try to help you int this.

This would solve many other issues, e.g. https://github.com/JuliaPy/pyjulia/issues/385 https://github.com/JuliaPy/pyjulia/issues/428