[libc][wctype][codegen] Bootstrap gen code for conversion data

[bassiounix]

We need Python script to fetch the unicode data from unicode.org and parse it to a usable representation by internal C++ code.
The script has 2 features:

• Fetch the necessary files
• Parse and generate the desired files to be consumed by wctype functions internally in libc.

[llvmbot]

@llvm/issue-subscribers-libc

Author: Muhammad Bassiouni (bassiounix)

We need Python script to fetch the unicode data from unicode.org and parse it to a usable representation by internal C++ code. The script has 2 features: - Fetch the necessary files - Parse and generate the desired files to be consumed by `wctype` functions internally in `libc`.