Split Ftp plugin into Ftp and FtpServer #3382

Job	Run time
coverage (ubuntu-20.04)	6m 9s
ubuntu-20.04 (package, non-mavsdk_server)	8m 51s
ubuntu-22.04 (package, non-mavsdk_server)	6m 28s
ubuntu-22.04 (style and proto check)	38m 0s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	7m 4s
ubuntu-20.04 (mavsdk_server, superbuild)	41m 9s
ubuntu-22.04 (mavsdk_server, superbuild)	39m 41s
alpine 3.16.0 (musl)	1h 4m 18s
Ubuntu/Debian packaging (Ubuntu 20.04)	11m 20s
android-arm	22m 49s
android-arm64	24m 18s
android-x86	24m 17s
android-x86_64	27m 13s
linux-armv6	7m 28s
linux-armv7	5m 58s
linux-arm64	6m 11s
linux-armv6-musl	45m 11s
linux-armv7l-musl	54m 9s
linux-arm64-musl	48m 21s
ios	42m 36s
ios_simulator	52m 15s
ubuntu-20.04 (mavsdk, hunter)	9m 18s
macOS	59m 37s
macOS-framework	58m 52s
Windows	1h 23m 48s
iOS XCFramework	1m 0s
	13h 16m 21s

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