feat: port just_passed, now_add and now_sub functions from jr

[ugol]

Three new time functions added in jr

Name: just_passed
Category: time
Description: returns a date in the past not before the given milliseconds
Parameters: milliseconds int
Localizable: false
Return: string
Example: jr template run --embedded '{{just_passed 60000}}'
Output: 2024-11-10 22:59:5

Name: now_add
Category: time
Description: returns a date in the future for the given milliseconds
Parameters: milliseconds int
Localizable: false
Return: string
Example: jr template run --embedded '{{now_add 60000}}'
Output: 2024-11-10 21:50:00

Name: now_sub
Category: time
Description: returns a date in the past for the given milliseconds
Parameters: milliseconds int
Localizable: false
Return: string
Example: jr template run --embedded '{{now_sub 60000}}'
Output: 2024-11-10 22:01:00