[bisq-network/bisq] Reduce initial request size (#4233)

[dmos62]

The main problem that we're trying to get around is that p2p objects are meant to be indexed by hash and don't have properties that would allow them to be indexable by something lightweight (like time). Bloom filters are normally the solution for these situations, but their processing is memory intensive, which opens up Bisq to denial-of-service attacks. It might be worthwhile to look at academic literature on the topic.

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