feat(cli): more Nushell support #565

Job	Run time
Test install.sh (Linux ARM64 glibc via QEMU)	2m 46s
Test install.sh (readonly shell config)	10s
Test install.ps1 (Windows x64, PowerShell 5.1)	55s
Test install.sh (Linux x64 glibc)	16s
Test install.sh (Linux x64 musl)	21s
Test install.ps1 (Windows x64)	52s
Test install.sh (Linux ARM64 musl via QEMU)	1m 23s
Test install.ps1 (Windows ARM64)	52s
Test install.ps1 (Windows x64, PowerShell 7.6)	1m 16s
Test install.ps1 (minimum-release-age)	20s
Test install.sh (macOS ARM64)	21s
Test install.sh (macOS x64)	31s
Test vp-setup.exe (pwsh)	4m 47s
	14m 50s

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