Remove globally-shared INACTIVE_SPAN RwLock #535

Job	Run time
fmt	16s
minimal-versions	2m 55s
Doc checks	1m 32s
Cargo deny checks	35s
Clippy checks	1m 42s
Check unstable	1m 38s
Test unstable	2m 19s
Check feature combinations (ubuntu-latest)	3m 39s
Run example (dry run)	1m 48s
Check feature combinations (macos-latest)	3m 46s
Test (x86_64-linux)	2m 51s
Test (arm64-android)	1m 5s
Test (aarch64-ios)	2m 19s
Test (arm-android)	1m 6s
Test (x86_64-macos)	3m 34s
Test (aarch64-linux)	2m 26s
Test (x86_64-windows)	3m 9s
Pull Request Status Checks	3s
	36m 43s

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