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

drizzle/sqlite/0037_burly_enchantress.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/sqlite/meta/_journal.json

@@ -260,6 +260,13 @@
       "when": 1790220943638,
       "tag": "0036_classy_nighthawk",
       "breakpoints": true
+    },
+    {
+      "idx": 37,
+      "version": "6",
+      "when": 1790224429343,
+      "tag": "0037_burly_enchantress",
+      "breakpoints": true
     }
   ]
 }