Add USD plugin #4349

Job	Run time
Update LFS data cache	4m 20s
android (armeabi-v7a)	2m 39s
external-build	1m 40s
android (arm64-v8a)	2m 44s
android (x86)	2m 11s
webassembly	1m 58s
android (x86_64)	2m 26s
macos (commit, x86_64, no-bundle)	16m 4s
macos (commit, arm64, no-bundle)	8m 21s
windows (commit)	8m 28s
macos (v9.2.6, x86_64, no-bundle)	6m 26s
python-packaging (ubuntu)	5m 19s
windows (v9.2.6)	10m 11s
linux (commit, standard)	10m 36s
macos (v9.2.6, arm64, no-bundle)	3m 30s
python-packaging (windows)	8m 45s
windows (v9.1.0)	7m 31s
macos (v9.1.0, x86_64, no-bundle)	9m 52s
linux (v9.2.6, standard)	8m 6s
python-packaging (macos)	2m 45s
macos (v9.1.0, arm64, no-bundle)	5m 55s
windows (v9.0.0)	7m 49s
linux (v9.1.0, standard)	7m 20s
macos (v9.0.0, x86_64, no-bundle)	8m 22s
linux (v9.0.0, standard)	5m 17s
macos (v9.0.0, arm64, no-bundle)	3m 17s
linux (headless, commit, raytracing, optional-deps, no-exclude-deprecated, egl)	6m 13s
coverage	8m 35s
macos (commit, bundle, x86_64)	7m 59s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, no-egl)	10m 46s
macos (commit, bundle, arm64)	5m 58s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, no-egl)	4m 29s
sanitizer (address)	8m 19s
static-analysis	4m 9s
sanitizer (thread)	11m 15s
sanitizer (undefined)	5m 7s
	3h 54m 42s

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