refactor: split code

[thomas-mauran]

Huge refactor

Description

The goal here is basically to refactor the game to split the big board file in many more. This pr will be followed by proper documentation on the website to explain all the changes

How Has This Been Tested?

Our rust tests and a lot of manual testing

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules