feat: add support for encrypted ssh key and ssh-agent #1027

Job	Run time
Cross Build to aarch64 (ubuntu-latest)	2m 43s
Build and Test (ubuntu-latest)	1m 26s
Build and Test (macos-13)	1m 36s
Build and Test (macos-14)	59s
Build and Test (no default features) (ubuntu-latest, core_installer)	43s
Build and Test (maa-sys, static) (ubuntu-latest)	36s
Build and Test (windows-latest)	4m 4s
Build and Test (no default features) (ubuntu-latest, git2)	1m 33s
Build and Test (maa-sys, static) (macos-13)	52s
Build and Test (no default features) (macos-14, core_installer)	41s
Build and Test (no default features) (macos-14, git2)	1m 56s
Build and Test (maa-sys, static) (macos-14)	30s
Build and Test (maa-sys, static) (windows-latest)	2m 28s
Build and Test (no default features) (windows-latest, core_installer)	2m 39s
Build and Test (no default features) (windows-latest, git2)	4m 13s
Coverage (ubuntu-latest)	1m 14s
Coverage (macos-14)	1m 22s
Coverage (windows-latest)	4m 2s
	33m 37s

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