Description

This commit adds a Lua function to calculate and format the remaining time until a given timestamp.
The function calculates the remaining time in days, hours, minutes, and seconds, and returns a string.
The logic includes proper pluralization for hours and minutes, and handles cases where the remaining time is less than a minute.

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