spv: Move initial startup sync from per-peer to syncer #2291
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This PR refactors the initial sync process of the spv syncer to being global instead of per-peer.
This removes a lot of duplicated effort that the wallet performed due to the prior sync process being per peer. In particular, fetching headers and cfilters is now done only once per batch of headers instead of being repeated per peer.
Future work will fix some lingering edge cases in the syncing process and will add further performance improvements.
Part of #2289