feat(editor): add highlighter (#10573)

Closes: [BS-2909](https://linear.app/affine-design/issue/BS-2909/新增highlighter)

### What's Changed!

Currently the highlighter tool is very similar to brush, but for the future, it's a standalone module.

* Added `Highlighter` element model
* Added `Highlighter` tool
* Added `Highlighter` entry to the global toolbar

blocksuite/affine/widgets/widget-edgeless-toolbar/src/edgeless-toolbar.ts

@@ -145,7 +145,7 @@ export class EdgelessToolbarWidget extends WidgetComponent<RootBlockModel> {
       height: 100%;
       background-color: var(--affine-border-color);
     }
-    .brush-and-eraser {
+    .pen-and-eraser {
       display: flex;
       height: 100%;
       gap: 4px;