Split Ftp plugin into Ftp and FtpServer #3418

Job	Run time
ubuntu-20.04 (package, non-mavsdk_server)	6m 44s
Ubuntu/Debian packaging (Ubuntu 20.04)	8m 14s
ubuntu-22.04 (package, non-mavsdk_server)	6m 17s
coverage (ubuntu-20.04)	6m 46s
alpine 3.16.0 (musl)	54m 22s
android-arm	23m 10s
linux-armv6	5m 58s
android-arm64	26m 28s
ios	22m 15s
linux-armv7	6m 3s
linux-armv6-musl	51m 45s
android-x86	24m 14s
ios_simulator	40m 13s
linux-arm64	6m 0s
linux-armv7l-musl	44m 11s
android-x86_64	28m 11s
linux-arm64-musl	1h 5m 8s
ubuntu-20.04 (mavsdk, hunter)	9m 1s
macOS	24m 56s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 50s
macOS-framework	25m 27s
ubuntu-22.04 (style and proto check)	28m 35s
ubuntu-20.04 (mavsdk_server, superbuild)	17s
Windows	1h 18m 40s
ubuntu-22.04 (mavsdk_server, superbuild)	10s
iOS XCFramework	0s
	9h 58m 55s

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