v1.2.9

🆕 New features

@visactor/vmind: Refactored the VMind basic framework: abstracted TaskNode, Application class, used Meta for flow arrangement, and improved code reusability and scalability.
@visactor/vmind: Intelligent chart generation: supports generating spec templates without a data set; supports filling data into spec templates.
@visactor/vmind: Intelligent chart generation: supports selecting chart types from a specified list of chart types.
@visactor/vmind: Built-in multiple sets of color schemes including Arco Design, Semi Design, and VeO Design.

Intelligent data aggregation: replaced alasql keyword in SQL to further improve the success rate of SQL execution.