Remove libp2p dependency from sc-network-sync #1030

Job	Run time
preflight / preflight	44s
cargo-check-benches (master)	24m 50s
cargo-check-benches (current)	28m 56s
test-frame-ui	31m 25s
test-full-crypto-feature	2m 37s
test-node-metrics	10m 23s
cargo-check-all-crate-macos	9m 37s
cargo-check-each-crate (1)	15m 14s
cargo-check-each-crate (2)	17m 29s
cargo-check-each-crate (3)	5m 4s
cargo-check-each-crate (4)	13m 57s
cargo-check-each-crate (5)	21m 9s
cargo-check-each-crate (6)	14m 0s
cargo-check-each-crate (7)	28m 45s
test-frame-examples-compile-to-wasm	3m 0s
test-deterministic-wasm	6m 30s
check-tracing	2m 20s
check-metadata-hash	6m 2s
cargo-hfuzz	7m 11s
node-bench-regression-guard	13s
All test misc tests passed	1s
	4h 9m 27s

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