typing Add fake classes to typing module (Issue #190)

[stlehmann]

Addresses issue #190.

Adds fake typing classes to allow using type-annotations with special types like Any, Union or the cast() function within Micropython. The classes are without functionality.

For proper type-checking use CPythons mypy or similar type-checkers.

[pfalcon]

Thanks for the patch! Please note that micropython-lib upstream repository is https://github.com/pfalcon/micropython-lib . I'm merging this patch there and invite you to contribute further there. If you choose to do so, please be sure to read the contribution guidelines: https://github.com/pfalcon/micropython-lib/wiki/ContributorGuidelines

[stlehmann]

Thanks for info. I will make further contributions to the Upstream repository.

[jonnor]

This is the upstream repository for the MicroPython project. The referenced project is the upstream of the pycopy project.

The base directory structure has been changed a bit in this repository. But apart from that the code in this merge request still seems relevant.

[Josverl]

I fully agree with the goal,
but IMHO this is superseded by #584

[jonnor]

Good point about that merge request being closer to ready! I had not seen it.