Add `Vec3::rotate_towards` #1498

Job	Run time
Lint	2m 9s
Check MSRV (ubuntu-latest, 1.68.2)	1m 50s
Test (ubuntu-latest, stable)	3m 15s
Check MSRV (macos-latest, 1.68.2)	2m 2s
Test (ubuntu-latest, beta)	3m 22s
Check MSRV (windows-latest, 1.68.2)	2m 27s
Test (ubuntu-latest, nightly)	3m 15s
Test wasm (stable, ubuntu-latest)	6m 4s
Test portable simd (ubuntu-latest, nightly)	44s
Test (macos-latest, stable)	4m 10s
Test portable simd (macos-latest, nightly)	43s
Test (macos-latest, beta)	2m 44s
Test portable simd (windows-latest, nightly)	1m 30s
Test (macos-latest, nightly)	3m 33s
Test (windows-latest, stable)	6m 43s
Test (windows-latest, beta)	5m 46s
Test (windows-latest, nightly)	5m 33s
	55m 50s

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