Rust

Add clean-data recipe, rename data/ dir to tmp-db/ (#306) #955

Job	Run time
linting	1m 6s
cross-testing (ubuntu-latest)	8m 50s
build-docker	3m 38s
cross-testing (windows-latest)	25m 21s
cross-testing (macos-latest)	9m 46s
	48m 41s

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