Marking that the converter function in the derived actor is cross-thread safe since it's just an Into() call. #683

Job	Run time
benches	3m 24s
docs	1m 17s
Clippy	53s
rustfmt	14s
Run the default tests	3m 5s
Test ractor without async-trait	3m 3s
Test ractor without span propogation	3m 16s
Test ractor with the `cluster` feature	3m 3s
Test ractor with the `blanket_serde` feature	3m 6s
Test ractor_cluster with native async traits	2m 48s
Test ractor_cluster with async_trait	2m 42s
Test ractor with the monitor API	3m 12s
	30m 3s

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