FromActorRef<TFrom> which allows to send messages convertible to orig… #653

Job	Run time
docs	1m 9s
Clippy	57s
Run the default tests	3m 22s
benches	3m 14s
Test ractor without async-trait	3m 4s
rustfmt	3s
Test ractor without span propogation	3m 19s
Test ractor with the `cluster` feature	3m 15s
Test ractor with the `blanket_serde` feature	3m 21s
Test ractor_cluster	2m 57s
	24m 41s

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