Bundled relations in `unsigned` are not taken into account - Show edits and reactions on message that occurred on a different day

[MadLittleMods]

Currently, the archive only shows reactions for messages when they occurred on the same day and the m.reaction event is available in the events displayed.

But reactions can happen across multiple days.

The homeserver already packages this info under event.unsigned['m.relations']['m.annotation'] but Hydrogen doesn't display it currently.

{
  "type": "m.room.message",
  "room_id": "!HBehERstyQBxyJDLfR:my.synapse.server",
  "sender": "@ericgittertester:my.synapse.server",
  "content": {
    "org.matrix.msc1767.text": "jyjyt",
    "body": "jyjyt",
    "msgtype": "m.text"
  },
  "origin_server_ts": 1645157112445,
  "unsigned": {
    "age": 572574399,
    "m.relations": {
      "m.annotation": {
        "chunk": [
          {
            "type": "m.reaction",
            "key": "😈",
            "count": 2
          },
          {
            "type": "m.reaction",
            "key": "🧠",
            "count": 1
          }
        ]
      }
    }
  },
  "event_id": "$eWlSLamYKEOS9XI08Fas9vhzSjzhnE7flyuhvmF6qtA",
  "user_id": "@ericgittertester:my.synapse.server",
  "age": 572574399
}

Message edits

This also happens with message edits. Hydrogen displays all events in the main timeline including edits separately and doesn't take into account the unsigned new content that is bundled with the original event.

Related to element-hq/hydrogen-web#535