Split OsString into separate package #209

Job	Run time
build (ubuntu-latest, 8.0.2, 3.8.1.0)	17m 50s
i386	4m 30s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	15m 23s
arm (arm32v7)	8m 33s
darwin_arm (self-hosted, macOS, ARM64, 9.2.6)	1s
arm (arm64v8)	5m 18s
darwin_arm (self-hosted, macOS, ARM64, 9.4.4)	46m 3s
build (ubuntu-latest, 8.2.2, 3.8.1.0)	6m 17s
build (ubuntu-latest, 8.4.4, 3.8.1.0)	5m 9s
build (ubuntu-latest, 8.6.5, 3.8.1.0)	5m 27s
build (ubuntu-latest, 8.8.4, 3.8.1.0)	5m 28s
build (ubuntu-latest, 8.10.7, 3.8.1.0)	5m 27s
build (ubuntu-latest, 9.0.2, 3.8.1.0)	5m 35s
build (ubuntu-latest, 9.2.7, 3.8.1.0)	3m 52s
build (ubuntu-latest, 9.4.5, 3.8.1.0)	4m 18s
build (ubuntu-latest, 9.6.1, 3.8.1.0)	4m 26s
build (macOS-latest, 9.4.5, 3.8.1.0)	12m 45s
build (macOS-latest, 9.6.1, 3.8.1.0)	37m 18s
build (windows-latest, 9.4.5, 3.8.1.0)	16m 24s
build (windows-latest, 9.6.1, 3.8.1.0)	16m 19s
	3h 46m 23s

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