Implement filtering search provider - Part 2

[nickvergessen]

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• Ref https://github.com/nextcloud/mail/pull/9002/files#diff-7de7f76c3f7677c4e31d8b497b2cd6dcd520f3206938678b2825675e3157f1ee
• Ref Advanced search: backend allows multiples terms to search server#40618

• Message search
  • Implement "modified" filter feat(search): Implement "person" and "modified" filters for the new g… #10909
  • Implement "person" filter feat(search): Implement "person" and "modified" filters for the new g… #10909
  • Implement custom filter to allow searching for comments from actors other than users, e.g. bots/guests/...
• Conversation search
  • Implement "person" filter - Common chats?
  • Implements IInAppSearch