Add a meta importer #6455

Job	Run time
Update LFS data cache	20s
external-build	1m 36s
android (armeabi-v7a)	1m 56s
android (arm64-v8a)	1m 45s
android (x86)	1m 55s
android (x86_64)	1m 42s
macos (commit)	8m 0s
linux (commit, standard)	6m 53s
macos (v9.3.1)	7m 52s
linux (v9.3.1, standard)	4m 54s
windows (commit, no-static)	3m 30s
macos (v9.2.6)	7m 32s
macos_arm (commit, no-bundle, no-static)	4m 23s
linux (v9.2.6, standard)	4m 15s
windows (v9.3.1, no-static)	4m 18s
macos_arm (v9.3.1, no-bundle, no-static)	3m 27s
linux (headless, commit, raytracing, optional-deps, no-exclude-deprecated, egl, no-static)	7m 17s
windows (v9.2.6, no-static)	3m 23s
macos_arm (v9.2.6, no-bundle, no-static)	3m 19s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, no-egl, no-static)	7m 1s
windows (commit, static)	3m 26s
macos_arm (commit, bundle, no-static)	4m 12s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, no-egl, ...	4m 54s
macos_arm (commit, no-bundle, static)	3m 42s
linux (static_libs, commit, no-raytracing, optional-deps, no-exclude-deprecated, no-egl, static)	6m 43s
coverage	7m 7s
sanitizer (address)	9m 7s
python-packaging (ubuntu-latest)	3m 5s
sanitizer (thread)	13m 9s
python-packaging (windows-latest)	4m 19s
sanitizer (undefined)	7m 14s
python-packaging (macos-13)	4m 11s
static-analysis	3m 56s
	2h 40m 23s

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