feat: move termix identity into a plugin (C6)

drizzle/postgres/0056_chilly_vindicator.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/postgres/meta/_journal.json

@@ -393,6 +393,13 @@
       "when": 1790298804216,
       "tag": "0055_jazzy_quasimodo",
       "breakpoints": true
+    },
+    {
+      "idx": 56,
+      "version": "7",
+      "when": 1790300572231,
+      "tag": "0056_chilly_vindicator",
+      "breakpoints": true
     }
   ]
 }