fix: bot promotion using UCI standard

[thomas-mauran]

Fix the promotion for the bot

Description

Bots can now promote their pawns

Fixes #92

How Has This Been Tested?

Letting an empty case on each side and putting a pawn in front to test the promotion. Since it's often the best move the chess engine choose it so we can try it out

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