Add look_at and look_to methods to Quat and Mat3. #1417

Job	Run time
Check MSRV (ubuntu-latest, 1.68.2)	2m 32s
Lint	2m 31s
Check MSRV (macos-latest, 1.68.2)	2m 41s
Test (ubuntu-latest, stable)	2m 55s
Check MSRV (windows-latest, 1.68.2)	3m 5s
Test portable simd (ubuntu-latest, nightly)	40s
Test (ubuntu-latest, beta)	2m 59s
Test wasm (stable, ubuntu-latest)	4m 26s
Test portable simd (macos-latest, nightly)	40s
Test (ubuntu-latest, nightly)	2m 48s
Test (macos-latest, stable)	2m 56s
Test portable simd (windows-latest, nightly)	1m 19s
Test (macos-latest, beta)	3m 3s
Test (macos-latest, nightly)	2m 41s
Test (windows-latest, stable)	5m 6s
Test (windows-latest, beta)	5m 4s
Test (windows-latest, nightly)	4m 46s
	50m 12s

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