refactor: workspace loading logic (#1966)

packages/env/package.json

@@ -12,7 +12,8 @@
   },
   "exports": {
     ".": "./src/index.ts",
-    "./constant": "./src/constant.ts"
+    "./constant": "./src/constant.ts",
+    "./blocksuite": "./src/blocksuite.ts"
   },
   "peerDependencies": {
     "@blocksuite/global": "0.0.0-20230409084303-221991d4-nightly"