feat: turn session recording into a plugin (B13)

drizzle/sqlite/0038_broad_avengers.sql

@@ -0,0 +1,5 @@
+-- session_recordings moved to the session-recording plugin, whose first
+-- migration renames it. Dropping it here would lose every recording, so
+-- this only stops drizzle tracking it. SELECT 1 because MySQL rejects an
+-- empty query.
+SELECT 1;