Incomplete light attribute support for DiskLight and DistantLight

[bbias]

Problem

DiskLight and DistantLight are missing several basic light attributes that are part of the standard USD light schema.

Missing DiskLight Attributes

• inputs:color (color3f)
• inputs:intensity (float)
• inputs:exposure (float)
• inputs:normalize (bool)
• inputs:enableColorTemperature (bool)
• inputs:colorTemperature (float)

Missing DistantLight Attributes

• inputs:color (color3f)
• inputs:intensity (float)
• inputs:exposure (float)
• inputs:normalize (bool)
• inputs:enableColorTemperature (bool)
• inputs:colorTemperature (float)

Current Behavior

• These essential light attributes are not parsed
• USD files lose basic lighting parameters for these light types
• Inconsistent attribute support across different light types

Expected Behavior

• All basic light attributes should be supported consistently across all light types
• Proper parsing and storage of color, intensity, exposure, and color temperature settings

Impact

Basic lighting parameters are lost when loading USD files, affecting the ability to accurately represent lighting setups.

[syoyo]

PR has been merged. I think this issue is ready to close.