Use std::optional for options #6326

Job	Run time
Update LFS data cache	1m 4s
android (armeabi-v7a)	1m 54s
external-build	1m 43s
android (arm64-v8a)	1m 57s
android (x86)	2m 0s
android (x86_64)	1m 55s
macos (commit)	10m 39s
linux (commit, standard)	8m 0s
macos (v9.3.1)	8m 56s
linux (v9.3.1, standard)	5m 55s
linux (v9.2.6, standard)	5m 6s
macos (v9.2.6)	8m 59s
coverage	7m 47s
linux (headless, commit, raytracing, optional-deps, no-exclude-deprecated, egl, no-static)	7m 17s
macos_arm (commit, no-bundle, no-static)	3m 57s
linux (exclude_deprecated, commit, raytracing, optional-deps, exclude-deprecated, no-egl, no-static)	7m 28s
macos_arm (v9.3.1, no-bundle, no-static)	4m 23s
macos_arm (v9.2.6, no-bundle, no-static)	3m 47s
linux (no_optional_deps, commit, no-raytracing, no-optional-deps, no-exclude-deprecated, no-egl, ...	5m 8s
python-packaging (ubuntu-latest)	3m 36s
macos_arm (commit, bundle, no-static)	4m 29s
sanitizer (address)	9m 46s
linux (static_libs, commit, no-raytracing, optional-deps, no-exclude-deprecated, no-egl, static)	7m 16s
python-packaging (windows-latest)	4m 48s
macos_arm (commit, no-bundle, static)	3m 48s
sanitizer (thread)	13m 26s
python-packaging (macos-13)	4m 59s
sanitizer (undefined)	7m 10s
static-analysis	3m 46s
windows (commit, no-static)	9m 40s
windows (v9.3.1, no-static)	7m 49s
windows (v9.2.6, no-static)	8m 29s
windows (commit, static)	9m 41s
	3h 16m 38s

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