Add a new NodeSessionMessage to get the state of initial sync #690

Job	Run time
benches	3m 22s
Clippy	1m 4s
docs	1m 20s
rustfmt	14s
Run the default tests	3m 8s
Test ractor without async-trait	3m 4s
Test ractor without span propogation	3m 3s
Test ractor with the `cluster` feature	3m 4s
Test ractor with the `blanket_serde` feature	3m 2s
Test ractor_cluster with native async traits	2m 45s
Test ractor_cluster with async_trait	2m 43s
Test ractor with the monitor API	3m 0s
	29m 49s

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