Camera: Add code to update View and Projection Matrices in update function

[PolygonalSun]

A user on the forums had recently found an issue when performing input while using an on-demand rendering loop. The issue was that the onViewMatrixChangedObservable wasn't firing as a part of pointer input. This behavior was present in previous versions. It was determined that the Lazy Picking changes may have caused this change because the aforementioned observable only fires during getViewMatrix() calls. Before the Lazy Picking implementation, this function was called as a part of the creation and assignment of the picking ray for a PickingInfo object. Since this ray is only created when picking happens, a pointer event that doesn't require picking info won't ever get to the point where getViewMatrix is called. Technically, these get functions should be called as a part of the camera's update function so the fix is to do just that.

Tests have been added to verify that onViewMatrixObservable and onProjectionMatrixObservable are firing properly.

Forum Link: https://forum.babylonjs.com/t/on-demand-rendering-solution-broken-since-5-29/36379/1
Issue Link: #13551

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

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[bghgary]

• Are there any performance implications with this?
• Should we add tests for this?

[PolygonalSun]

• Are there any performance implications with this?

This shouldn't have any significant perf impacts. Worst case scenario is that we have a couple more if statement evals during a frame's lifespan

• Should we add tests for this?

I'm not sure that we can write tests any of the get*Matrix() calls but I am in the process of writing tests to verify that the observables are firing.