feat: use classic-level in bun (#8575)

**Motivation**

- #7280 

**Description**

- It looks like `classic-level` now works with the latest version of bun
hooray

Author: wemeetagain

packages/db/package.json

@@ -19,13 +19,13 @@
       "import": "./lib/index.js"
     },
     "./controller/level": {
-      "bun": "./src/controller/level_bun.ts",
+      "bun": "./src/controller/level.ts",
       "import": "./lib/controller/level.js"
     }
   },
   "imports": {
     "#controller/level": {
-      "bun": "./src/controller/level_bun.ts",
+      "bun": "./src/controller/level.ts",
       "import": "./src/controller/level.js"
     }
   },