Split Ftp plugin into Ftp and FtpServer #3421

Job	Run time
coverage (ubuntu-20.04)	7m 50s
ubuntu-20.04 (mavsdk, hunter)	8m 39s
ubuntu-20.04 (package, non-mavsdk_server)	7m 23s
Ubuntu/Debian packaging (Ubuntu 20.04)	10m 37s
alpine 3.16.0 (musl)	19m 23s
ubuntu-22.04 (package, non-mavsdk_server)	6m 9s
linux-armv6	5m 49s
linux-armv7	5m 40s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 32s
linux-arm64	5m 5s
ubuntu-20.04 (mavsdk_server, superbuild)	38m 8s
ubuntu-22.04 (style and proto check)	1m 38s
ubuntu-22.04 (mavsdk_server, superbuild)	37m 47s
android-arm	6m 27s
linux-armv6-musl	17m 19s
android-arm64	8m 56s
ios	9m 59s
linux-armv7l-musl	16m 37s
android-x86	6m 28s
ios_simulator	11m 7s
linux-arm64-musl	13m 34s
android-x86_64	6m 27s
Windows	1h 27m 55s
macOS	48m 52s
macOS-framework	48m 24s
iOS XCFramework	0s
	7h 21m 45s

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