chore: Renaming package zenv to @modlog/zenv #1

Job	Run time
build (macos-latest, aarch64-apple-darwin, darwin-arm64, zenv)	2s
build (ubuntu-latest, aarch64-unknown-linux-gnu, linux-arm64, zenv)	2s
build (ubuntu-latest, x86_64-unknown-linux-gnu, linux-x64, zenv)	2s
build (macos-latest, x86_64-apple-darwin, darwin-x64, zenv)	3s
build (windows-latest, x86_64-pc-windows-msvc, win32-x64, zenv.exe)	4s
publish	0s
	13s

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