Split Ftp plugin into Ftp and FtpServer #3356

Job	Run time
alpine 3.16.0 (musl)	23s
coverage (ubuntu-20.04)	8s
Ubuntu/Debian packaging (Ubuntu 20.04)	9s
ubuntu-20.04 (package, non-mavsdk_server)	27s
ubuntu-22.04 (package, non-mavsdk_server)	31s
android-arm	5s
android-arm64	9s
android-x86	7s
android-x86_64	8s
linux-armv6-musl	6s
linux-armv7l-musl	6s
linux-arm64-musl	5s
linux-armv6	8s
linux-armv7	8s
linux-arm64	7s
ios	15s
ios_simulator	17s
macOS	19s
macOS-framework	12s
ubuntu-20.04 (mavsdk, hunter)	4s
ubuntu-22.04 (style and proto check)	4s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6s
ubuntu-20.04 (mavsdk_server, superbuild)	6s
ubuntu-22.04 (mavsdk_server, superbuild)	4s
Windows	13s
iOS XCFramework	0s
	4m 27s

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