Add `Vec3::rotate_towards` #1499

Job	Run time
Lint	2m 45s
Check MSRV (ubuntu-latest, 1.68.2)	1m 55s
Test (ubuntu-latest, stable)	3m 15s
Check MSRV (macos-latest, 1.68.2)	2m 6s
Test portable simd (ubuntu-latest, nightly)	45s
Test (ubuntu-latest, beta)	3m 20s
Test wasm (stable, ubuntu-latest)	5m 47s
Check MSRV (windows-latest, 1.68.2)	2m 24s
Test portable simd (macos-latest, nightly)	1m 2s
Test (ubuntu-latest, nightly)	3m 8s
Test portable simd (windows-latest, nightly)	1m 24s
Test (macos-latest, stable)	3m 33s
Test (macos-latest, beta)	4m 5s
Test (macos-latest, nightly)	4m 13s
Test (windows-latest, stable)	6m 13s
Test (windows-latest, beta)	5m 58s
Test (windows-latest, nightly)	5m 35s
	57m 28s

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