Refs #19096 - WIP - Add Inline comments events and raise them

- Add inline comments specific zope events and raise them on inline
  comment add/reply/close/re-open/delete
Refs #19096 - WIP - Add content rules events and string substitutions
Refs #19096 - WIP - Add more content rules string substitutions
Refs #19096 - Update HISTORY.txt
Merge branch 'notifications'