Split Ftp plugin into Ftp and FtpServer #3358

Job	Run time
coverage (ubuntu-20.04)	6m 48s
Ubuntu/Debian packaging (Ubuntu 20.04)	10m 41s
alpine 3.16.0 (musl)	13m 56s
ubuntu-20.04 (package, non-mavsdk_server)	6m 42s
ubuntu-22.04 (package, non-mavsdk_server)	6m 21s
linux-armv6-musl	17m 41s
linux-armv7l-musl	12m 4s
linux-arm64-musl	13m 31s
linux-armv6	6m 33s
linux-armv7	4m 53s
linux-arm64	4m 48s
ios	10m 5s
ios_simulator	9m 45s
macOS	13m 3s
macOS-framework	13m 20s
ubuntu-20.04 (mavsdk, hunter)	9m 12s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6m 8s
android-arm	6m 13s
android-arm64	6m 27s
android-x86	6m 18s
android-x86_64	6m 1s
ubuntu-22.04 (style and proto check)	1m 26s
ubuntu-20.04 (mavsdk_server, superbuild)	12m 24s
ubuntu-22.04 (mavsdk_server, superbuild)	12m 30s
Windows	7m 32s
iOS XCFramework	0s
	3h 44m 22s

Provide feedback