camera: support multiple cameras within one instance #4235

Job	Run time
coverage (ubuntu-20.04)	16s
alpine 3.19.0 (musl)	8s
Ubuntu/Debian packaging (Ubuntu 20.04)	16s
ubuntu-20.04 (package, non-mavsdk_server)	16s
ubuntu-22.04 (package, non-mavsdk_server)	12s
android-arm	20s
ubuntu-24.04 (package, non-mavsdk_server)	16s
linux-armv6	7s
android-arm64	8s
linux-armv6-musl	7s
linux-armv7	19s
android-x86	21s
linux-armv7l-musl	19s
linux-arm64	19s
ios	6s
android-x86_64	20s
linux-arm64-musl	8s
linux-arm64-lts	20s
ios_simulator_x64	6s
ios_simulator_arm64	8s
macOS x64	1s
ubuntu-20.04 (mavsdk, hunter)	1s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	1s
macOS arm64	1s
ubuntu-24.04 (style and proto check)	1s
macOS framework x64	1s
macOS framework arm64	1s
ubuntu-20.04 (mavsdk_server, superbuild)	1s
Windows	1s
ubuntu-22.04 (mavsdk_server, superbuild)	1s
ubuntu-24.04 (mavsdk_server, superbuild)	1s
ubuntu-24.04 (mavsdk_server, superbuild)	1s
ubuntu-24.04 (mavsdk_server, superbuild)	1s
iOS XCFramework	1s
	4m 46s

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