[Feature] (TypeScript) The `OptionDataItemObject` type has not be exported

[ZacharyBear]

What problem does this feature solve?

Some typescript supporting for the OptionDataItemObject and its child interfaces.

Now I have to define the OptionDataItem in my own project:

// TODO The same as ECharts' declaration
type OptionDataItemObject<T> = {
    id?: OptionId;
    name?: OptionName;
    groupId?: OptionId;
    childGroupId?: OptionId;
    value?: T[] | T;
    selected?: boolean;
};

const load = (data: OptionDataItemObject<number>) => {
  //...
}

What does the proposed API look like?

I don't need to describe the ECharts' types