feat: create MoveService.getKingMove

[gabrielg2020]

Description

Create moves for king pieces.

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature that might cause existing functionality to change)
• Performance improvement
• Other (please specify)

Checklist

• I have performed a self-review of my code.
• I have commented my code, especially in hard-to-understand areas.
• I have updated the documentation where necessary.
• My changes generate no new warnings or errors.
• I have added tests that prove my fix is effective or that my feature works.
• All new and existing tests pass.
• My PR title follows the Conventional Commits specification.