feat: add settings mgmt and split debug transport snippets

firmware/libs/settings_mgmt/Kconfig

@@ -0,0 +1,14 @@
+menuconfig SETTINGS_MGMT
+    bool "Settings Management"
+    default y
+    select SETTINGS
+    select ZMS
+    help
+      Library for initializing and managing the settings subsystem.
+      ZMS (Zephyr Memory Storage) backend is automatically selected when ZMS is enabled.
+
+if SETTINGS_MGMT
+    module = SETTINGS_MGMT
+    module-str = settings_mgmt
+    source "subsys/logging/Kconfig.template.log_config"
+endif # SETTINGS_MGMT