Add a new NodeSessionMessage to get the state of initial sync #688

Job	Run time
benches	3m 17s
docs	1m 25s
Clippy	1m 2s
rustfmt	14s
Run the default tests	2m 44s
Test ractor without async-trait	2m 43s
Test ractor without span propogation	2m 48s
Test ractor with the `cluster` feature	2m 50s
Test ractor with the `blanket_serde` feature	2m 49s
Test ractor_cluster with native async traits	1m 0s
Test ractor_cluster with async_trait	56s
Test ractor with the monitor API	2m 49s
	24m 37s

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