Fix behavior of range node with inverted output and clamp

[makkbru]

when the range node is used to invert the input, activating clamp will make it output the wrong result. its probably clamping to min and max in the input without checking if the min value is smaller than the max value

[jstone-lucasfilm]

Adding a link to the current graph definition of the range node in MaterialX:

https://github.com/AcademySoftwareFoundation/MaterialX/blob/main/libraries/stdlib/stdlib_ng.mtlx#L3568

[sckleung]

Hello, I am a new contributor for ASWF Dev Days this year and would like to look in to this as a first issue. I am unable to log on to the Slack channel currently.

[jstone-lucasfilm]

Welcome @sckleung! Here's a link that we often recommend for creating an ASWF Slack account, and you can find our team there under #materialx.

https://www.aswf.io/get-involved/