test(editor): collab table test (#10506)

1. **Table UI Enhancements - Test IDs Added**
   - Added `data-testid` attributes to several table components for better testability:
     - `add-column-button` for the column addition button
     - `add-row-button` for the row addition button
     - `drag-column-handle` for column drag handles
     - `drag-row-handle` for row drag handles

2. **New Test Infrastructure**
   - Added new testing utilities in `tests/kit/src/bs/`:
     - `misc.ts`: Added `waitNextFrame` utility function for handling animation frame timing in tests
     - `table.ts`: Added comprehensive table testing utilities including:
       - `createTable`: Creates a new table with initial cells
       - `getCellText`: Retrieves text from a specific table cell
       - `inputToCell`: Inputs text into a specific table cell
       - `clickDeleteButtonInTableMenu`: Handles table deletion operations

3. **New Collaboration Test**
   - Added a new test file `tests/affine-local/e2e/blocksuite/table/collab.spec.ts` that tests table collaboration features:
     - Tests synchronization between two pages (A and B)
     - Verifies table operations sync correctly:
       - Adding columns and rows
       - Inputting cell content
       - Deleting columns and rows
     - Validates cell content consistency across both pages
     - Tests the complete table manipulation workflow in a collaborative setting

4. **Package Configuration Update**
   - Modified `tests/kit/package.json` to expose new test utilities:
     - Added new export mapping: `"./bs/*": "./src/bs/*.ts"` to make the new table testing utilities accessible

This PR primarily focuses on improving table testing infrastructure and adding comprehensive collaboration tests for the table functionality, while also enhancing component testability through data-test-ids.

tests/kit/src/bs/misc.ts

@@ -0,0 +1,7 @@
+import type { Page } from '@playwright/test';
+
+export async function waitNextFrame(page: Page) {
+  await page.evaluate(
+    () => new Promise(resolve => requestAnimationFrame(resolve))
+  );
+}