feat: lua linter

[maattch]

Description

Makes lua editing much easier to those who use an IDE with a linter addon (such as LuaLS by sumneko)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• 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