Split Ftp plugin into Ftp and FtpServer #3390

Job	Run time
ubuntu-20.04 (mavsdk, hunter)	33s
coverage (ubuntu-20.04)	38s
alpine 3.16.0 (musl)	57s
Ubuntu/Debian packaging (Ubuntu 20.04)	57s
ubuntu-20.04 (package, non-mavsdk_server)	2m 9s
ubuntu-22.04 (package, non-mavsdk_server)	2m 6s
linux-armv6	1m 20s
linux-armv7	1m 3s
linux-arm64	1m 5s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	1m 1s
ubuntu-22.04 (style and proto check)	1m 16s
ubuntu-20.04 (mavsdk_server, superbuild)	50s
ubuntu-22.04 (mavsdk_server, superbuild)	44s
android-arm	2m 27s
android-arm64	2m 41s
android-x86	2m 28s
android-x86_64	2m 34s
linux-armv6-musl	1m 35s
linux-armv7l-musl	1m 48s
linux-arm64-musl	1m 35s
ios	1m 22s
ios_simulator	1m 9s
macOS	1m 6s
macOS-framework	1m 0s
Windows	6m 58s
iOS XCFramework	0s
	41m 22s

Provide feedback