Split Ftp plugin into Ftp and FtpServer #3436

Job	Run time
alpine 3.16.0 (musl)	13m 43s
Ubuntu/Debian packaging (Ubuntu 20.04)	9m 14s
coverage (ubuntu-20.04)	5m 24s
ubuntu-20.04 (package, non-mavsdk_server)	6m 59s
ubuntu-22.04 (package, non-mavsdk_server)	6m 14s
android-arm	7m 18s
linux-armv6-musl	14m 47s
android-arm64	6m 36s
linux-armv6	6m 45s
linux-armv7l-musl	12m 32s
android-x86	6m 37s
linux-armv7	4m 51s
ios	6m 41s
linux-arm64-musl	13m 27s
android-x86_64	8m 4s
linux-arm64	4m 48s
ios_simulator	5m 39s
ubuntu-20.04 (mavsdk, hunter)	4m 48s
macOS	14m 9s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 11s
macOS-framework	17m 42s
ubuntu-22.04 (style and proto check)	2m 47s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 22s
Windows	15m 2s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 24s
iOS XCFramework	1m 1s
	3h 42m 5s

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