fix(editor): image size and xywh when converting attachment to image (#10200)

In Edgeless, the image size should be read when converting attachment to image:

* fix `size`
* fix `xywh`

blocksuite/affine/shared/src/utils/index.ts

@@ -8,6 +8,7 @@ export * from './edgeless';
 export * from './event';
 export * from './file';
 export * from './fractional-indexing';
+export * from './image';
 export * from './insert';
 export * from './is-abort-error';
 export * from './math';