Move has_waker boolean to Registry #278

Job	Run time
CheckTargets	1m 40s
Docs	22s
Clippy	18s
MinimalVersions (ubuntu-latest)	32s
MinimalVersions (macos-latest)	50s
MinimalVersions (windows-latest)	1m 1s
Nightly	33s
MSRV	1m 46s
Rustfmt	16s
Sanitizer (address)	1m 48s
Sanitizer (leak)	1m 20s
Sanitizer (memory)	2m 45s
Sanitizer (thread)	1m 22s
Test (ubuntu-latest)	1m 12s
Test (macos-latest)	1m 45s
Test (windows-latest)	2m 12s
TestPoll	1m 0s
Passed	1s
	20m 43s

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