feat: convert secret-sources into a plugin (B20)

drizzle/postgres/meta/_journal.json

@@ -358,6 +358,13 @@
       "when": 1790282597585,
       "tag": "0050_acoustic_lady_bullseye",
       "breakpoints": true
+    },
+    {
+      "idx": 51,
+      "version": "7",
+      "when": 1790284031484,
+      "tag": "0051_useful_slyde",
+      "breakpoints": true
     }
   ]
 }