Split Ftp plugin into Ftp and FtpServer #3461

Job	Run time
ubuntu-20.04 (package, non-mavsdk_server)	7m 51s
coverage (ubuntu-20.04)	6m 45s
ubuntu-22.04 (package, non-mavsdk_server)	9m 19s
Ubuntu/Debian packaging (Ubuntu 20.04)	13m 43s
alpine 3.16.0 (musl)	17m 46s
android-arm	8m 30s
linux-armv6	6m 30s
android-arm64	7m 11s
ios	6m 52s
linux-armv7	7m 21s
linux-armv6-musl	15m 51s
ios_simulator	6m 54s
android-x86	9m 5s
linux-armv7l-musl	17m 2s
linux-arm64	10m 41s
android-x86_64	6m 48s
ubuntu-20.04 (mavsdk, hunter)	8m 38s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	7m 6s
ubuntu-22.04 (style and proto check)	1m 47s
linux-arm64-musl	16m 7s
ubuntu-20.04 (mavsdk_server, superbuild)	2s
macOS	13m 33s
ubuntu-20.04 (mavsdk_server, superbuild)	8s
Windows	14m 51s
macOS-framework	11m 1s
ubuntu-22.04 (mavsdk_server, superbuild)	1s
ubuntu-22.04 (mavsdk_server, superbuild)	14s
iOS XCFramework	56s
	3h 52m 33s

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