f92bfe0f0b
Make use of our sparse value writer in more places. Namely, when using animated Camera or Light properties, this will prevent a needless stream of unchanging values being written into the USD file [1]. Skeletons and armatures benefit too but less so as typically the primary benefit only applies to the comparatively small `scale` transform attribute, which typically remains unchanged from frame to frame. The newly added `set_attribute` common code can, and eventually will, be used to reduce boilerplate elsewhere where we do the same sparse writing dance. Ref #130759 Pull Request: https://projects.blender.org/blender/blender/pulls/131333
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