refactor(editor): move export manager to surface block extensions (#10231)

blocksuite/affine/block-surface/package.json

@@ -24,9 +24,11 @@
     "@preact/signals-core": "^1.8.0",
     "@toeverything/theme": "^1.1.7",
     "fractional-indexing": "^3.2.0",
+    "html2canvas": "^1.4.1",
     "lit": "^3.2.0",
     "lodash.chunk": "^4.2.0",
     "nanoid": "^5.0.7",
+    "pdf-lib": "^1.17.1",
     "yjs": "^13.6.21",
     "zod": "^3.23.8"
   },