Add `renv.lock` validation hook #1323

Job	Run time
macOS-latest (release, brew)	3m 24s
macOS-latest (release, conda)	5m 16s
macOS-latest (release, pip)	3m 1s
windows-latest (release, pip)	4m 36s
windows-latest (release, conda)	13m 12s
windows-latest (devel, conda)	14m 46s
ubuntu-latest (release, pip)	17m 37s
ubuntu-latest (release, conda)	20m 29s
	1h 22m 21s

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