Add tokio taskname registration for use in tokio-console #631

Job	Run time
Lints	47s
Documentation	17s
Memory leaks	3m 49s
Build Examples	2m 31s
Build (aarch64-unknown-linux-gnu)	35s
Minimal Dependency Versions	1m 4s
Build (x86_64-pc-windows-gnu)	58s
Minimal Dependency Versions (MSRV)	34s
Build (x86_64-unknown-linux-gnu)	45s
Minimum Supported Rust Version	23s
Semantic Versioning	20s
Test Suite	3m 47s
Publish version	0s
	15m 50s

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