Marking that the converter function in the derived actor is cross-thread safe since it's just an Into() call. #682

Job	Run time
Clippy	56s
rustfmt	17s
docs	1m 22s
benches	3m 19s
Run the default tests	3m 2s
Test ractor without async-trait	3m 4s
Test ractor without span propogation	3m 12s
Test ractor with the `cluster` feature	3m 7s
Test ractor with the `blanket_serde` feature	3m 11s
Test ractor_cluster with native async traits	2m 46s
Test ractor_cluster with async_trait	2m 47s
Test ractor with the monitor API	3m 5s
	30m 8s

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