Relative time in weeks

**Describe the bug**
Ability to get "weeks" from relative time plugin.
It would be nice, possibly optional, to be able to get "weeks" if relative time if between week and month.

**Expected behavior**
If relative time is used like `fromNow`, and the result is at least 7 days but shorter than a month, then return string like `2 weeks ago`

**Information**
- Day.js Version 1.11.7
- OS: Windows 11
- Browser Edge108.0.1462.76
- Time zone: GTM-06:00 DST

The issue points to the relative time plugin and its fromNow behavior; start there and inspect how intervals between seven days and a month are currently selected. Done means that a value such as two weeks in that range can return "2 weeks ago," with the optional behavior resolved.

Written by the indexing model from the issue text.