Add public version of Firebase C++ style guide #13625

Job	Run time
check_and_prepare	21s
build-desktop-windows-latest-x64-openssl	1h 40m 50s
build-desktop-ubuntu-22.04-x64-openssl	39m 32s
build-android-ubuntu-22.04	51m 8s
build-android-windows-latest	1h 16m 9s
build-android-macos-14	56m 54s
build-ios-macos-14	1h 2m 52s
build-tvos-macos-14	37m 22s
test-tvos-macos-14-tvos_simulator	18m 56s
test-ios-macos-14-simulator_target-gameloop	20m 59s
test-ios-macos-14-ios_target-gameloop	14m 52s
test-android-ubuntu-22.04-android_target-gameloop	10m 38s
test-android-ubuntu-22.04-emulator_ftl_target-gameloop	9m 1s
test-android-macos-14-emulator_ftl_target-gameloop	10m 51s
test-android-windows-latest-emulator_ftl_target-gameloop	28m 32s
test-android-windows-latest-android_target-gameloop	29m 40s
test-android-macos-14-android_target-gameloop	21m 45s
test-desktop-ubuntu-22.04-x64-openssl	4m 9s
test-desktop-windows-latest-x64-openssl	8m 25s
summarize-results	18s
attempt-retry	0s
	10h 3m 14s

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