Split Ftp plugin into Ftp and FtpServer #3458

Job	Run time
coverage (ubuntu-20.04)	6m 4s
alpine 3.16.0 (musl)	1h 4m 17s
ubuntu-20.04 (package, non-mavsdk_server)	9m 46s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 5s
ubuntu-22.04 (package, non-mavsdk_server)	7m 6s
android-arm	7m 9s
linux-armv6	6m 59s
android-arm64	7m 25s
linux-armv6-musl	14m 59s
linux-armv7	7m 31s
android-x86	9m 0s
linux-armv7l-musl	14m 47s
linux-arm64	6m 16s
android-x86_64	9m 3s
linux-arm64-musl	16m 10s
ios	13m 26s
ios_simulator	11m 59s
macOS	17m 26s
ubuntu-20.04 (mavsdk, hunter)	9m 10s
macOS-framework	11m 11s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6m 42s
ubuntu-22.04 (style and proto check)	1m 18s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 8s
Windows	17m 24s
ubuntu-22.04 (mavsdk_server, superbuild)	12m 46s
iOS XCFramework	1m 1s
	5h 10m 8s

Provide feedback