Split Ftp plugin into Ftp and FtpServer #3433

Job	Run time
alpine 3.16.0 (musl)	16m 55s
ubuntu-20.04 (package, non-mavsdk_server)	6m 39s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 46s
coverage (ubuntu-20.04)	5m 45s
ubuntu-22.04 (package, non-mavsdk_server)	6m 24s
linux-armv6	6m 57s
android-arm	8m 48s
linux-armv7	5m 13s
linux-armv6-musl	13m 51s
android-arm64	6m 25s
linux-arm64	5m 21s
linux-armv7l-musl	12m 35s
android-x86	9m 50s
ios	12m 21s
linux-arm64-musl	13m 35s
android-x86_64	6m 10s
ios_simulator	10m 19s
macOS	16m 16s
macOS-framework	16m 53s
ubuntu-20.04 (mavsdk, hunter)	5m 6s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	6m 43s
ubuntu-22.04 (style and proto check)	1m 18s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 1s
Windows	14m 31s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 45s
iOS XCFramework	54s
	3h 59m 21s

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