Add weekday() and current_time() functions

[EduardoRSeifert]

Description ✍️

This PR adds 2 new functions to parsec, weekday and current_time.

weekday()

weekday will calculate the weekday based on a date or datetime, and will return an integer if no locale is passed or a string with the translated weekday name if a locale is passed

current_time()

current_time will return the current_time in gmt. If the (optional) integer argument is passed, it'll return the current_time considering the argument as an offset.

Examples

'weekday("2024-12-05")' will return 4, and 'weekday("2021-03-21", "pt-BR")' will return 'Quinta-Feira'

At the time of writing:
current_time() will return 19:09:13 and current_time(-3) 16:09:13 (GMT -3 is brasil time)

Overview 🔍

Overview of the feature if possible (screenshot, gif, etc)

Checks ☑️

• Example