feat: swaync notifications module

Adds a new module which connects to SwayNC to display information from the notifications deamon.

Resolves #7

examples/config.json

@@ -141,6 +141,18 @@
     },
     {
       "type": "clock"
+    },
+    {
+      "type": "notifications",
+      "show_count": true,
+      "icons": {
+        "closed_none": "󰍥",
+        "closed_some": "󱥂",
+        "closed_dnd": "󱅯",
+        "open_none": "󰍡",
+        "open_some": "󱥁",
+        "open_dnd": "󱅮"
+      }
     }
   ]
 }