Split Ftp plugin into Ftp and FtpServer #3452

Job	Run time
ubuntu-20.04 (package, non-mavsdk_server)	8m 5s
alpine 3.16.0 (musl)	52m 24s
coverage (ubuntu-20.04)	5m 15s
ubuntu-22.04 (package, non-mavsdk_server)	9m 11s
Ubuntu/Debian packaging (Ubuntu 20.04)	9m 5s
android-arm	7m 19s
linux-armv6	4m 51s
android-arm64	8m 7s
ios	8m 18s
linux-armv7	4m 49s
linux-armv6-musl	14m 17s
android-x86	9m 15s
ios_simulator	6m 15s
linux-arm64	6m 15s
linux-armv7l-musl	12m 33s
android-x86_64	7m 37s
linux-arm64-musl	13m 39s
macOS	9m 14s
ubuntu-20.04 (mavsdk, hunter)	9m 15s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 33s
macOS-framework	15m 12s
ubuntu-22.04 (style and proto check)	1m 49s
ubuntu-20.04 (mavsdk_server, superbuild)	10m 58s
Windows	14m 12s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 9s
iOS XCFramework	1m 12s
	4h 24m 49s

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