Add remaining timespan options

While I was testing the updated timespan I realized that some of the players who would use it might not be fully aware of what skript supports for their arguments. As such I added the remaining options for weeks, months and years. Additionally added `1h` as one of the default suggestions <img width="438" height="216" alt="image" src="https://github.com/user-attachments/assets/c6d446b0-22a8-4ce3-a030-6f03521de48f" />