Bluetooth: Mesh: Break up mesh settings

The mesh settings.c module is a giant piece of code responsible for
storing the mesh stack configuration. Such approach makes it difficult
to control the data to be stored, breaks the stack modules'
encapsulation by forcing them to reveal the internal kitchen, which
leads to unpleasant issues such as zephyrproject-rtos#19799.

This commit moves the responsibility of storing the configuration
to corresponding modules while keeping control of the moment of storing
the configuration and of starting the stack after the settingss loading
is completed.

This doesn't introduce any abstraction between the mesh settings.c and
other modules as it will add more complexity and overhead than necessary
for the actual task.

Fixes zephyrproject-rtos#19850

Signed-off-by: Pavel Vasilyev <pavel.vasilyev@nordicsemi.no>

subsys/bluetooth/mesh/Kconfig

@@ -818,6 +818,12 @@ config BT_MESH_DEBUG_CDB
 	help
 	  Use this option to enable configuration database debug logs.
 
+config BT_MESH_DEBUG_CFG
+	bool "Configuration debug"
+	help
+	  Use this option to enable node configuration debug logs for the
+	  Bluetooth Mesh functionality.
+
 endif # BT_MESH_DEBUG
 
 endif # BT_MESH