Autodesk: Add render-selected-edge-from-face global env var

[erikaharrison-adsk]

Description of Change(s)

To improve the performance of using Geometry Shader in HdStorm, expose an environment variable to enable/disable render-selected-edge-from-face feature, which may trigger geometry shader.

In HdStorm, when rendering mesh using HdMeshGeomStyleSurf/HdMeshGeomStyleHull geomStyle, the Geometry Shader might be enabled to support the render-selected-edge-from-face feature, this could bring performance overhead if the application doesn't need that feature, so, adding an environment variable to enable/disable render-selected-edge-from-face feature in HdStorm,

Fixes Issue(s)

• N/A

• [X] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-9644

[jesschimein]

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