迁移 4.0 简单色块图

### AntV Open Source Contribution Plan（可选）

- [x] 我同意将这个 Issue 参与 OSCP 计划

### Issue 类型

中级任务

### 任务介绍

将以下 4.0 色块图迁移到 5.0 的案例里面：

- https://github.com/antvis/G2/blob/master/examples/heatmap/basic/demo/basic.ts
- 把上一个转化成极坐标系的图，参考这个[例子](https://g2-v4.antv.vision/zh/examples/heatmap/basic#polar-heatmap)
- https://github.com/antvis/G2/blob/master/examples/heatmap/calendar/demo/calendar-horizontal.ts
- https://github.com/antvis/G2/blob/master/examples/heatmap/calendar/demo/calendar.ts

### 参考说明

- 动机和注意事项：https://github.com/antvis/G2/issues/5894
- 相关 PR：https://github.com/antvis/G2/pull/5893

Start by reading the four listed heatmap demo files in G2 4.0 and the motivation in issue #5894, then compare them with the G2 5.0 example structure. Migrate the basic, polar, horizontal-calendar, and calendar heatmaps into the 5.0 examples and run each demo to confirm the charts render as intended.

Written by the indexing model from the issue text.