Add the `from module import a as b` syntax to PyCall

I have implemented a macro to replicate the `from module import a as b, c as d` syntax as `@pyfrom module import a as b, c as d`
https://github.com/AutoActuary/PyFrom.jl

Would it be possible to get something like this into PyCall?

Start by reviewing PyCall.jl and the linked PyFrom.jl implementation to understand how the proposed @pyfrom syntax maps Python imports into Julia bindings. Confirm whether PyCall should adopt equivalent syntax and how aliases and multiple imports should behave; done means the feature is integrated with appropriate coverage, though no target files or tests are named in the issue.

Vom Indexierungsmodell aus dem Issue-Text verfasst.