Create a public vtkext module that can be used by both libf3d and plugins #5236

Job	Run time
Update LFS data cache	5s
external-build	1m 40s
android (armeabi-v7a)	1m 56s
android (arm64-v8a)	1m 47s
android (x86)	1m 44s
android (x86_64)	1m 56s
webassembly	1m 30s
linux (commit, standard)	5m 5s
coverage	5m 9s
linux (v9.3.0, standard)	5m 11s
macos (commit, no-bundle)	10m 57s
linux (v9.2.6, standard)	4m 32s
macos_arm (commit, no-bundle)	3m 36s
macos (v9.3.0, no-bundle)	17m 45s
macos_arm (v9.3.0, no-bundle)	3m 39s
linux (v9.1.0, standard)	4m 7s
macos (v9.2.6, no-bundle)	5m 45s
python-packaging (ubuntu)	2m 53s
macos_arm (v9.2.6, no-bundle)	4m 28s
linux (v9.0.0, standard)	3m 25s
macos (commit, bundle)	9m 27s
python-packaging (windows)	4m 48s
linux (headless, commit, raytracing, optional-deps, no-exclude-deprecated, egl)	4m 42s
macos_arm (commit, bundle)	4m 58s
python-packaging (macos)	2m 43s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, no-egl)	4m 51s
windows (commit)	6m 39s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, no-egl)	3m 11s
sanitizer (address)	7m 30s
static-analysis	3m 20s
windows (v9.3.0)	8m 4s
sanitizer (thread)	3m 33s
windows (v9.2.6)	6m 17s
sanitizer (undefined)	4m 55s
	2h 42m 8s

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