Properly implement timer using dedicated timer thread #609

Job	Run time
rust_ci (ubuntu-latest, stable)	53s
rust_ci (windows-latest, beta)	59s
rust_ci (ubuntu-latest, beta)	1m 11s
rust_ci (windows-latest, stable)	1m 3s
rust_ci (macos-latest, beta)	1m 14s
rust_ci (macos-latest, stable)	56s
	6m 16s

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