Inspector v2: Make properties services and component structure consistent and stub out services for the rest of the entity types

[ryantrem]

The consistent pattern now is:

• One properties service definition / file per top level entity type (as defined by scene, e.g. scene. Textures, scene.rootNodes, etc.). For example, texturePropertiesService.tsx, nodePropertiesService.tsx, etc.
• One file per concrete entity of the class hierarchy. For example, nodeProperties.tsx, abstractMeshProperties.tsx, meshProperties.tsx, etc.
• One react component per concrete entity per section. For example, AbstractMeshGeneralProperties, AbstractMeshAdvancedProperties (both in abstractMeshProperties.tsx).

So far this seems to be a good balance of not too many files, and files not being too big.

I also stubbed out the *PropertiesService.tsx files for the remaining top level entity types.

[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]

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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[bjsplat]

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[bjsplat]

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[bjsplat]

Visualization tests for WebGPU

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[bjsplat]

WebGL2 visualization test reporter:

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