Transport layers

Topics
	Bluetooth transport
	This allows to use the MCUmgr SMP protocol over Bluetooth.
	Dummy transport
	This allows to use the MCUmgr SMP protocol over a dummy transport, usually for testing purposes.
	SMP transport
	MCUmgr SMP transport API.
	Serial transport
	This allows to use the MCUmgr SMP protocol over serial.
	Shell transport
	This allows to use the MCUmgr SMP protocol over Zephyr shell.
	UDP transport
	This allows to use the MCUmgr SMP protocol over UDP.

Detailed Description