Split Ftp plugin into Ftp and FtpServer #3434

Job	Run time
ubuntu-20.04 (mavsdk, hunter)	4m 55s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 46s
coverage (ubuntu-20.04)	6m 30s
alpine 3.16.0 (musl)	13m 41s
Ubuntu/Debian packaging (Ubuntu 20.04)	11m 24s
ubuntu-20.04 (package, non-mavsdk_server)	6m 47s
android-arm	7m 31s
ubuntu-22.04 (package, non-mavsdk_server)	8m 22s
linux-armv6	4m 57s
android-arm64	6m 50s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 20s
linux-armv7	5m 45s
android-x86	6m 9s
linux-arm64	6m 8s
android-x86_64	6m 21s
linux-armv6-musl	13m 19s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 14s
linux-armv7l-musl	12m 33s
linux-arm64-musl	16m 36s
ubuntu-22.04 (style and proto check)	25s
ios	6m 46s
ios_simulator	6m 52s
macOS	15m 29s
Windows	14m 37s
macOS-framework	13m 28s
iOS XCFramework	1m 3s
	3h 43m 48s

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