feat(p2p/discovery): Implement `archival` discovery + syncing of historic blocks and blobs

[renaynay]

Based on #3150 and #3170

TODO

• [x] test archival request routing per node type
• [ ] benchmarks for LN
• [x] renaming some things inside discovery away from being full-node-centric
• [ ] clarify / make disc metrics generic as there will now be 2 instances of discovery happening
• [x] rebase
• [ ] swamp test