Split OsString into separate package #206

Job	Run time
arm (arm32v7)	4m 25s
i386	5m 22s
darwin_arm (self-hosted, macOS, ARM64, 8.10.7)	6s
build (ubuntu-latest, 8.0.2, 3.8.1.0)	13m 25s
arm (arm64v8)	3m 19s
darwin_arm (self-hosted, macOS, ARM64, 9.2.6)	39m 53s
build (ubuntu-latest, 8.2.2, 3.8.1.0)	9m 15s
darwin_arm (self-hosted, macOS, ARM64, 9.4.4)	1s
build (ubuntu-latest, 8.4.4, 3.8.1.0)	6m 6s
build (ubuntu-latest, 8.6.5, 3.8.1.0)	5m 58s
build (ubuntu-latest, 8.8.4, 3.8.1.0)	6m 10s
build (ubuntu-latest, 8.10.7, 3.8.1.0)	6m 44s
build (ubuntu-latest, 9.0.2, 3.8.1.0)	7m 21s
build (ubuntu-latest, 9.2.7, 3.8.1.0)	5m 29s
build (ubuntu-latest, 9.4.5, 3.8.1.0)	4m 54s
build (ubuntu-latest, 9.6.1, 3.8.1.0)	5m 13s
build (macOS-latest, 9.4.5, 3.8.1.0)	37m 46s
build (macOS-latest, 9.6.1, 3.8.1.0)	13m 37s
build (windows-latest, 9.4.5, 3.8.1.0)	21m 1s
build (windows-latest, 9.6.1, 3.8.1.0)	23m 2s
	3h 39m 7s

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