Remove typing/annotations from input

As type annotations and `typing` is getting added to lots of Python code as they convert to Python 3 only code, and this project doesnt intend to support that per https://github.com/kovidgoyal/rapydscript-ng/issues/126 , perhaps this project could be enhanced to strip out `typing` and type annotations from the input as it is processing the input, so it can handle a Python 3 code which uses these.

Currently any `import typing` causes rapydscript to fail.

https://github.com/abarker/strip-hints has a reasonable implementation of this in Python, that might be used as a guide for what be needed to implement this natively in rapydscript-ng. It doesnt strip the `typing` import, but that doesn't seem to difficult, and I've raised it as a feature request at https://github.com/abarker/strip-hints/issues/12

The issue names no files or tests; begin by tracing how rapydscript-ng processes Python input and compare the desired behavior with the referenced strip-hints implementation. Done means Python 3 input containing type annotations and an import of typing is accepted without causing rapydscript to fail.

Written by the indexing model from the issue text.