build: Enable pxr_boost::python for Python bindings #1

Job	Run time
Windows (3.7, cp37)	1s
Linux (cp37, /opt/python/cp37-cp37m/bin/python, 3.7)	2m 37s
Windows (3.8, cp38)	1s
macOS (3.7, python3.7, cp37)	1s
Linux (cp38, /opt/python/cp38-cp38/bin/python, 3.8)	2m 37s
Windows (3.9, cp39)	1s
macOS (3.8, python3.8, cp38)	1s
Linux (cp39, /opt/python/cp39-cp39/bin/python, 3.9)	2m 37s
Windows (3.10, cp310)	1s
macOS (3.9, python3.9, cp39)	1s
Linux (cp310, /opt/python/cp310-cp310/bin/python, 3.10)	2m 35s
Windows (3.11, cp311)	1s
Linux (cp311, /opt/python/cp311-cp311/bin/python, 3.11)	2m 37s
macOS (3.10, python3.10, cp310)	2m 26s
macOS (3.11, python3.11, cp311)	2m 30s
CollectPackages	2s
Test	1s
	18m 10s

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