Use typed attributes in registry and roothash services

[kostko]

The new typed event attribute API introduced in #4033 makes it harder to mess up key/value pairs when emitting events. We should also change the remaining services (e.g., registry and roothash) to use it.

This requires changing some of the internal event types and is a breaking change (not consensus-breaking, but it requires nodes to resync from an empty state if they want to query events on old heights due to the event semantics changing).