Add a wizard script for local development in `hermetic_build/`

[diegomarquezp]

Setting up my local for development of #3723 involved quite the amount of trial and error for renaming files, using right locations, etc. Despite I was one of the developers of these scripts and the development guide covers all what's needed, the fact that setting up my local after a few months was toilsome made me think we could use a wizard script.

Such wizard script could simply setup the ${HOME}/.library_generation folder with the necessary tools, maybe asking to input versions or default to what's inferred from pom files (e.g. please introduce generator version (default: x.x.x):). Also installing the scripts dependencies and the python package itself in --editable mode.

[blakeli0]

Discussed with the GAPIC SMEs, the development.md is sufficient for now since we don't have many active works. And the guide is likely going to change due to 1PP, we can revisit it once 1PP is done.
Deprioritizing to P3.