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Spawn `cargo add` in the `new` command #444

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Run time

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Job	Run time
Build example component	1m 52s
Install cargo-component	3m 22s
Run tests (ubuntu-latest)	7m 10s
Format source code	6s
Run tests (macos-latest)	14m 56s
Run tests (windows-latest)	13m 57s
	41m 23s