Add identifier column to plugins table for cleaner plugin lookup

- Added 'identifier' column (unique) for machine-readable plugin ID
- 'name' now used for display name only
- Updated trial-execution to look up by identifier first, then name
- Added migration script for existing databases

drizzle/meta/_journal.json

@@ -0,0 +1,13 @@
+{
+  "version": "7",
+  "dialect": "postgresql",
+  "entries": [
+    {
+      "idx": 0,
+      "version": "7",
+      "when": 1774137504617,
+      "tag": "0000_old_tattoo",
+      "breakpoints": true
+    }
+  ]
+}