Make ChunkStateWitness a Tier1 network message

[jancionear]

In stateless validation chunk producer sends out a ChunkStateWItness message to every chunk validator responsible for validating the corresponding chunk. Currently it's a Tier2 RoutedMessage, but I think it would be better to make it a Tier1 message.

AFAIU Tier1 is meant to exchange information between validators in a quick and stable manner. There's a direct Tier1 connection between every pair of validators, so the connections are much more reliable and efficient than routed Tier2 connections.
ChunkStateWitness messages are sent only between chunk validators and chunk producers, and additionally they're big and time-sensitive. I think they'd be a good fit for Tier1.

Having direct connections could also allow us to ban peers which send invalid ChunkStateWItness messages, which was disabled in #10667

cc @saketh-are

[walnut-the-cat]

how much useful this can be at this moment, considering the low participation rate of tier 1?

[jancionear]

how much useful this can be at this moment, considering the low participation rate of tier 1?

Is the participation rate of tier 1 network low? I though that all active validators participate in the tier1 network o-0

[walnut-the-cat]

That's the hope, but I don't think it's happening right now.
cc. @saketh-are

[jancionear]

It appears that this has been implemented in #11021