Split Ftp plugin into Ftp and FtpServer #3459

Job	Run time
Ubuntu/Debian packaging (Ubuntu 20.04)	10m 49s
alpine 3.16.0 (musl)	1h 20m 32s
coverage (ubuntu-20.04)	7m 22s
ubuntu-20.04 (package, non-mavsdk_server)	8m 4s
ubuntu-22.04 (package, non-mavsdk_server)	8m 34s
android-arm	8m 24s
linux-armv6-musl	16m 5s
android-arm64	7m 44s
linux-armv6	6m 4s
linux-armv7l-musl	17m 32s
linux-armv7	6m 11s
android-x86	8m 27s
ios	8m 28s
linux-arm64-musl	20m 16s
linux-arm64	6m 20s
android-x86_64	6m 44s
ios_simulator	9m 40s
macOS	16m 51s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	7m 34s
macOS-framework	12m 44s
ubuntu-22.04 (style and proto check)	1m 19s
ubuntu-20.04 (mavsdk, hunter)	8m 35s
ubuntu-20.04 (mavsdk_server, superbuild)	13m 8s
Windows	15m 56s
ubuntu-22.04 (mavsdk_server, superbuild)	11m 38s
iOS XCFramework	1m 10s
	5h 26m 11s

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