refactor: split cli.rs into focused submodules #4748

Job	Run time
detect-changes	7s
download-previous-rolldown-binaries	10s
Build vite-plus packages (windows-latest)	7m 55s
Build vite-plus packages (ubuntu-latest)	7m 23s
${{ matrix.project.name }} E2E test (${{ matrix.os }})	1s
Notify on failure	1s
	15m 37s

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