fix(editor): limit max width when uploading or pasting image into edgeless (#9273)

[BS-2180](https://linear.app/affine-design/issue/BS-2180/白板中粘贴图片，限定一下最大宽度)

blocksuite/affine/model/src/consts/image.ts

@@ -0,0 +1 @@
+export const MAX_IMAGE_WIDTH = 460;

blocksuite/affine/model/src/consts/index.ts

@@ -2,6 +2,7 @@ export * from './brush.js';
 export * from './connector.js';
 export * from './doc.js';
 export * from './frame.js';
+export * from './image.js';
 export * from './line.js';
 export * from './mindmap.js';
 export * from './note.js';