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Add Rust Playground metadata (#445) #1079

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Run time

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Job	Run time
clippy	25s
rustfmt	11s
no_std	12s
MSRV (1.75.0, ubuntu)	49s
test (ubuntu, stable)	48s
MSRV (1.75.0, macOS)	51s
test (ubuntu, nightly)	34s
rustdoc	20s
MSRV (1.75.0, windows)	1m 22s
test features (std)	54s
test (macOS, stable)	49s
rustdoc (private)	19s
test features (no_std)	58s
test (macOS, nightly)	47s
test (windows, stable)	1m 54s
test (windows, nightly)	1m 32s
release (GitHub)	0s
	12m 45s