Add two new USD specific settings to RMan Args. #19

Job	Run time
Linux (cp38, /opt/python/cp38-cp38/bin/python, 3.8)	26m 3s
Linux (cp39, /opt/python/cp39-cp39/bin/python, 3.9)	26m 3s
Linux (cp310, /opt/python/cp310-cp310/bin/python, 3.10)	26m 14s
Linux (cp311, /opt/python/cp311-cp311/bin/python, 3.11)	25m 53s
Linux (cp312, /opt/python/cp312-cp312/bin/python, 3.12)	26m 1s
macOS (3.8, python3.8, cp38)	45m 33s
macOS (3.9, python3.9, cp39)	44m 54s
macOS (3.10, python3.10, cp310)	52m 28s
macOS (3.11, python3.11, cp311)	56m 53s
macOS (3.12, python3.12, cp312)	49m 4s
Windows (3.8, cp38)	27m 56s
Windows (3.9, cp39)	28m 11s
Windows (3.10, cp310)	28m 3s
Windows (3.11, cp311)	28m 57s
Windows (3.12, cp312)	28m 7s
CollectPackages	20s
Test (Linux_Python38, 3.8, ubuntu-20.04, python3)	31s
Test (Linux_Python39, 3.9, ubuntu-20.04, python3)	24s
Test (Linux_Python310, 3.10, ubuntu-20.04, python3)	22s
Test (Linux_Python311, 3.11, ubuntu-20.04, python3)	19s
Test (Linux_Python312, 3.12, ubuntu-20.04, python3)	23s
Test (Mac_Python38, 3.8, macos-13, python3)	38s
Test (Mac_Python39, 3.9, macos-13, python3)	36s
Test (Mac_Python310, 3.10, macos-13, python3)	39s
Test (Mac_Python311, 3.11, macos-13, python3)	32s
Test (Mac_Python312, 3.12, macos-13, python3)	33s
Test (Windows_Python38, 3.8, windows-2019, python3)	1m 6s
Test (Windows_Python39, 3.9, windows-2019, python3)	42s
Test (Windows_Python310, 3.10, windows-2019, python3)	56s
Test (Windows_Python311, 3.11, windows-2019, python3)	46s
Test (Windows_Python312, 3.12, windows-2019, python3)	47s
	8h 49m 54s

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