feat: Variable aggregation supports aggregating data into dictionary types.

[wangliang181230]

What this PR does / why we need it?

feat: Variable aggregation supports aggregating data into dictionary types.
新特性：变量聚合 支持聚合为字典类型的数据。

兼容性说明：
数据值有所变更，但做过向下兼容处理，如果担心版本回退问题，我可以将数据值 variable_to_array 变更回 variable_to_json

fixes #4904

Summary of your change

1. 界面变更:
   宽度变宽了，由默认的 340px 加大为 450px

2. 执行效果:

3. 其他类型保持不变:

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[wangliang181230]

之前提交的代码，顺便优化一下语法

[zhanweizhang7]

Hi, please resolve the rebase conflict before we can continue the review. Also, could you squash the commits to clean up the history a bit? Thanks!

[wangliang181230]

Hi, please resolve the rebase conflict before we can continue the review. Also, could you squash the commits to clean up the history a bit? Thanks!

@zhanweizhang7
The rebase conflict has been resolved.
I don't know how to squash the commits, but I know that GitHub will automatically squash the commits when this PR is merged.