Add a Simple Sitemap plugin for Monitoring

dpi → closed merge request !14

@gbyte I've reworked the 3.x MR to work with 4.x,
Notes:

• Added a new convenience method on the new Sitemap config entity. Ported date usage to new method.
• Removed the sitemap metadata services from the v3 version, now that Sitemaps are config.
• Functionality irt Monitoring remains the same as documented above.
• Contains the same test coverage, reworked for 4.x compat

4.2.2 merged in.

@WalkingDexter @dpi please check out the gitlab review. Let's not merge this before discussing if this should instead go into a 3rd party simple_sitemap_monitoring module which I feel should be the way to go ATM.

@WalkingDexter @dpi please check out the gitlab review. Let's not merge this before discussing if this should instead go into a 3rd party simple_sitemap_monitoring module which I feel should be the way to go ATM.

I think this functionality can be added directly to the Monitoring module. It already contains plugins for other contrib modules.

@dpi Let us know if you think this issue should be reassigned to the monitoring module and the code moved into it or if this should go into a 3rd party module. Also please check out the points in the gitlab review.

Created an issue in the Monitoring module and adapted the proposed code. See ✨ New sensor: Simple XML Sitemap Active for further work.

walkingdexter → closed merge request !75