Rust CI

Add dev container, GitHub Codespaces support #24

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Run time

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Job	Run time
build (stable, ubuntu-latest)	8m 27s
build (stable, macos-latest)	11m 13s
build (stable, windows-2019)	14m 3s
build (beta, ubuntu-latest)	10m 0s
build (beta, macos-latest)	14m 7s
build (beta, windows-2019)	12m 58s
build (nightly, ubuntu-latest)	7m 38s
build (nightly, macos-latest)	14m 34s
build (nightly, windows-2019)	15m 17s
rustfmt	22s
clippy	2m 20s
	1h 50m 59s