Split Ftp plugin into Ftp and FtpServer #3491

Job	Run time
coverage (ubuntu-20.04)	6m 27s
Ubuntu/Debian packaging (Ubuntu 20.04)	9m 58s
alpine 3.16.0 (musl)	47m 42s
ubuntu-20.04 (package, non-mavsdk_server)	6m 8s
ubuntu-22.04 (package, non-mavsdk_server)	8m 58s
android-arm	6m 47s
linux-armv6	5m 21s
android-arm64	9m 23s
linux-armv6-musl	18m 21s
linux-armv7	6m 8s
linux-armv7l-musl	14m 56s
ios	6m 44s
android-x86	8m 19s
linux-arm64	6m 32s
ios_simulator	8m 34s
linux-arm64-musl	15m 54s
android-x86_64	9m 9s
macOS	18m 13s
ubuntu-20.04 (mavsdk, hunter)	5m 35s
macOS-framework	17m 9s
ubuntu-22.04 (style and proto check)	1m 28s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	8m 41s
ubuntu-20.04 (mavsdk_server, superbuild)	14m 36s
Windows	15m 26s
ubuntu-22.04 (mavsdk_server, superbuild)	11m 27s
iOS XCFramework	1m 2s
	4h 48m 58s

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