feat: add event_types_to_copy_on_room_upgrade in hs config

[odelcroi]

Add event_types_to_copy_on_room_upgrade in config to allow transfering custom state events when upgrading a room

As stated here : https://spec.matrix.org/latest/client-server-api/#server-behaviour-21 "The exact details for what is transferred is left as an implementation detail"

Pull Request Checklist

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