[feature] Price monitoring for xbox.com pages

**Version and OS**
0.50.5 on Docker

**Is your feature request related to a problem? Please describe.**
I'm using the price and restock feature on pages in xbox.com site to monitor discounts on videogames. The software tracks the In stock value, but not the price.

**Describe the solution you'd like**
I'd like Changedetection.io to get the price from the page, and track when it changes.

**Describe the use-case and give concrete real-world examples**
Example: https://www.xbox.com/it-IT/games/store/baldurs-gate-3/9ND58LQTG09T/0010

**Additional context**
Attaching a screenshot showing the price in the page.

The information are available in the HTML served by the link.

Start by reproducing the reported behavior with the Xbox URL and inspect the HTML shown in the issue, focusing on how the existing price and restock monitoring handles page values. Done means the monitor detects and reports price changes on Xbox.com pages without losing the existing stock-status behavior; no specific test or source file is named in the issue.

Written by the indexing model from the issue text.