feat: move session sharing and collab rooms into a plugin (B12)

drizzle/postgres/0041_watery_zeigeist.sql

@@ -0,0 +1,6 @@
+-- session_shares, session_share_participants, collab_rooms and
+-- collab_room_members moved to the session-sharing plugin, whose first
+-- migration renames them. Dropping them here would lose every share and
+-- room, so this only stops drizzle tracking them. SELECT 1 because MySQL
+-- rejects an empty query.
+SELECT 1;

drizzle/postgres/meta/_journal.json

@@ -288,6 +288,13 @@
       "when": 1790220944274,
       "tag": "0040_narrow_hellion",
       "breakpoints": true
+    },
+    {
+      "idx": 41,
+      "version": "7",
+      "when": 1790224430003,
+      "tag": "0041_watery_zeigeist",
+      "breakpoints": true
     }
   ]
 }