Prepare syncing for parallel sync strategies (#3224)
This PR should supersede https://github.com/paritytech/polkadot-sdk/pull/2814 and accomplish the same with less changes. It's needed to run sync strategies in parallel, like running `ChainSync` and `GapSync` as independent strategies, and running `ChainSync` and Sync 2.0 alongside each other. The difference with https://github.com/paritytech/polkadot-sdk/pull/2814 is that we allow simultaneous requests to remote peers initiated by different strategies, as this is not tracked on the remote node in any way. Therefore, `PeerPool` is not needed. CC @skunert --------- Co-authored-by: Sebastian Kunert <[email protected]>
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