refactor: move all packages to `crates` subdir #1074

Job	Run time
Cross Build to aarch64 (ubuntu-latest)	3m 27s
Cross Build to aarch64 (windows-latest)	4m 18s
Build and Test (ubuntu-latest)	1m 28s
Build and Test (no default features) (ubuntu-latest, core_installer)	1m 40s
Build and Test (macos-13)	2m 27s
Build and Test (maa-sys, static) (ubuntu-latest)	21s
Build and Test (no default features) (ubuntu-latest, git2)	1m 39s
Build and Test (macos-latest)	1m 38s
Build and Test (maa-sys, static) (macos-13)	47s
Build and Test (no default features) (macos-latest, core_installer)	1m 38s
Build and Test (windows-latest)	4m 22s
Build and Test (maa-sys, static) (macos-latest)	27s
Build and Test (no default features) (macos-latest, git2)	2m 7s
Build and Test (maa-sys, static) (windows-latest)	1m 45s
Build and Test (no default features) (windows-latest, core_installer)	3m 39s
Build and Test (no default features) (windows-latest, git2)	4m 30s
Coverage (ubuntu-latest)	1m 8s
Coverage (macos-latest)	1m 23s
Coverage (windows-latest)	3m 37s
	42m 21s

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