fix(p2p/client/peer_agnostic): limit sync request block ranges #2227
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Some nodes (like Juno) do not limit how many responses they return for a sync query. Since Pathfinder requests the whole gap (possibly hundreds of thousands of blocks) by default this leads to a sync request that then times out (because we currently have a "global" timeout on the sync protocol streams).
This change makes sure that we never request more than 500 blocks worth of data at once.
Closes #2121