Split Ftp plugin into Ftp and FtpServer #3453

Job	Run time
Ubuntu/Debian packaging (Ubuntu 20.04)	9m 48s
coverage (ubuntu-20.04)	5m 6s
alpine 3.16.0 (musl)	1h 16m 17s
ubuntu-20.04 (package, non-mavsdk_server)	8m 2s
ubuntu-22.04 (package, non-mavsdk_server)	7m 39s
android-arm	8m 2s
linux-armv6	6m 15s
linux-armv6-musl	14m 52s
android-arm64	7m 3s
linux-armv7	6m 9s
android-x86	7m 9s
linux-armv7l-musl	15m 12s
ios	11m 36s
linux-arm64	6m 34s
android-x86_64	7m 15s
linux-arm64-musl	16m 50s
ios_simulator	9m 56s
macOS	14m 34s
ubuntu-20.04 (mavsdk, hunter)	10m 52s
macOS-framework	11m 36s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	8m 40s
ubuntu-22.04 (style and proto check)	1m 25s
ubuntu-20.04 (mavsdk_server, superbuild)	14m 43s
Windows	15m 5s
ubuntu-22.04 (mavsdk_server, superbuild)	14m 24s
iOS XCFramework	1m 25s
	5h 16m 29s

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