refactor: split `dirs` module into a separate crate #979

Job	Run time
Cross Build to aarch64 (ubuntu-latest)	2m 57s
Build and Test (maa-sys, static) (ubuntu-latest)	13s
Build and Test (ubuntu-latest)	47s
Build and Test (no default features) (ubuntu-latest, core_installer)	1m 20s
Build and Test (macos-12)	1m 23s
Build and Test (maa-sys, static) (macos-12)	30s
Build and Test (no default features) (ubuntu-latest, git2)	1m 24s
Build and Test (macos-14)	47s
Build and Test (maa-sys, static) (macos-14)	23s
Build and Test (no default features) (macos-14, core_installer)	1m 20s
Build and Test (windows-latest)	2m 36s
Build and Test (maa-sys, static) (windows-latest)	2m 6s
Build and Test (no default features) (macos-14, git2)	1m 41s
Build and Test (no default features) (windows-latest, core_installer)	3m 47s
Build and Test (no default features) (windows-latest, git2)	3m 48s
Coverage (ubuntu-latest)	58s
Coverage (macos-14)	55s
Coverage (windows-latest)	4m 14s
	31m 9s

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