feat: move termix identity into a plugin (C6)

drizzle/sqlite/0052_public_professor_monster.sql

@@ -0,0 +1,4 @@
+-- termix_identities, termix_identity_keys and termix_identity_ca move to the
+-- termix-identity plugin's adopted tables at activation. Dropping them here
+-- would lose the data first.
+SELECT 1;

drizzle/sqlite/meta/_journal.json

@@ -365,6 +365,13 @@
       "when": 1790298803438,
       "tag": "0051_conscious_blur",
       "breakpoints": true
+    },
+    {
+      "idx": 52,
+      "version": "6",
+      "when": 1790300571504,
+      "tag": "0052_public_professor_monster",
+      "breakpoints": true
     }
   ]
 }