Enable CFG generation.

[Rot127]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

Adds the ability to generate a CFG at a givne address.

Test plan

Added

Closing issues

...

[Rot127]

Please take a look at it again, when you have time please.

[XVilka]

@Rot127 please fix this type comment and feel free to merge once it's done:

Run python3 rz-bindgen/src/lint.py \
Missing type comment at <rizin/librz/core/cgraph.c:910:101> (token is not a comment)
Error: Process completed with exit code 1.