Add ImGui support #7053

Job	Run time
Update LFS data cache	2m 3s
external-build	1m 37s
android (armeabi-v7a)	1m 58s
android (arm64-v8a)	2m 8s
android (x86)	1m 57s
android (x86_64)	1m 58s
windows (commit, no-static)	3m 54s
macos_arm (commit, no-bundle, no-static)	1s
windows (v9.3.1, no-static)	4m 0s
macos (commit)	11s
macos_arm (v9.3.1, no-bundle, no-static)	1s
linux (commit, standard)	2m 25s
windows (v9.2.6, no-static)	3m 53s
macos (v9.3.1)	51s
macos_arm (commit, bundle, no-static)	1s
linux (v9.3.1, standard)	2m 31s
windows (commit, static)	5m 53s
macos (v9.2.6)	1m 6s
macos_arm (commit, no-bundle, static)	1s
linux (v9.2.6, standard)	2m 53s
linux (egl, commit, raytracing, optional-deps, no-exclude-deprecated, egl, no-static)	2m 25s
coverage	2m 19s
python-packaging (ubuntu-latest)	2m 9s
sanitizer (address)	2m 47s
linux (osmesa, commit, raytracing, optional-deps, no-exclude-deprecated, osmesa, no-static)	2m 22s
python-packaging (windows-latest)	3m 31s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, auto, no-static)	2m 25s
sanitizer (thread)	2m 23s
static-analysis	1m 51s
sanitizer (undefined)	1m 55s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, auto, no...	2m 5s
python-packaging (macos-13)	1s
linux (static_libs, commit, no-raytracing, optional-deps, no-exclude-deprecated, auto, static)	2m 48s
	1h 8m 23s

Provide feedback