Split Ftp plugin into Ftp and FtpServer #3480

Job	Run time
alpine 3.16.0 (musl)	1h 5m 36s
ubuntu-20.04 (package, non-mavsdk_server)	11m 13s
Ubuntu/Debian packaging (Ubuntu 20.04)	10m 11s
ubuntu-22.04 (package, non-mavsdk_server)	6m 59s
coverage (ubuntu-20.04)	5m 25s
android-arm	7m 33s
linux-armv6	7m 27s
android-arm64	9m 8s
ios	10m 7s
linux-armv7	8m 50s
android-x86	8m 14s
linux-armv6-musl	14m 49s
ios_simulator	8m 50s
linux-arm64	6m 16s
linux-armv7l-musl	14m 35s
android-x86_64	7m 13s
linux-arm64-musl	19m 3s
macOS	18m 22s
ubuntu-20.04 (mavsdk, hunter)	9m 14s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	8m 31s
ubuntu-22.04 (style and proto check)	1m 47s
macOS-framework	17m 2s
ubuntu-20.04 (mavsdk_server, superbuild)	14m 59s
Windows	16m 39s
ubuntu-22.04 (mavsdk_server, superbuild)	14m 26s
iOS XCFramework	1m 1s
	5h 23m 30s

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