Add `Rotation2d` (#11658) #38417

Job	Run time
ci	3m 29s
toml	1m 53s
miri	6m 2s
build (windows-latest)	8m 20s
check-bevy-internal-imports	3s
build (ubuntu-latest)	3m 25s
check-cfg	1m 46s
check-doc	7m 29s
build (macos-latest)	4m 14s
check-missing-examples-in-docs	38s
run-examples-macos-metal	4m 25s
typos	5s
check-missing-features-in-docs	32s
markdownlint	1m 10s
check-compiles	4m 31s
build-wasm	1m 18s
msrv	1m 34s
	50m 54s

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