feat: change engine api request handler #9010
Merged
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ref #8742
changes how engine messages will be processed
we expected that the tree will take care of all requests in sequence that will require a bunch of blocking IO.
so this type sets up a bidrectional channel that delegates events and polls a channel from the tree for actions (e.g. start backfill, download blocks etc..). then the actual tree task is a loop over incoming requests.