refactor: improve readability and optimize toPosition function

[omarcopires]

Description

This pull request refactors the string.toPosition function to improve readability and optimize the code. The main changes include:

• Renaming variables to more descriptive names.
• Optimized pattern matching by reusing patterns.
• Returning nil when no pattern is matched, improving error handling.

These changes make the code clearer and more efficient without altering its functionality.

Fix

Interface: Scripts Interface
Script ID: E:\Repositorios Git\baiak-yurots\data/scripts\talkactions\gm\position.lua:callback
Error Description: ...it\baiak-yurots\data/scripts\talkactions\gm\position.lua:13: attempt to call method 'toPosition' (a nil value)
stack traceback:
        [C]: in function 'toPosition'
        ...it\baiak-yurots\data/scripts\talkactions\gm\position.lua:13: in function <...it\baiak-yurots\data/scripts\talkactions\gm\position.lua:3>

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

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

[QuebradaZN]

Working