feat(date-picker): RangePicker allowEmpty

[ChuTingzj]

Types of changes

• New feature
• Bug fix
• Enhancement
• Documentation change
• Coding style change
• Component style change
• Refactoring
• Test cases
• Continuous integration
• Typescript definition change
• Breaking change
• Others

Background and context

#2022

Solution

When the allowEmpty attribute is passed in, a confirmation button is added to the panel, and when a certain interval is determined, click the OK button, and the empty interval will be automatically filled with the value of the corresponding interval of the referenceInterval attribute passed in.

当传入allowEmpty属性时，为panel增加确认按钮，当确定某一区间时，点击确定按钮，将为空缺的区间自动填充传入的referenceInterval属性的对应区间的值

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
DatePicker	为RangePicker组件新增allowEmpty和referenceInterval属性，允许在选择范围时传入空值	Add allowEmpty and referenceInterval properties for RangePicker component, allowing to pass in empty value when selecting a range	#2022

Checklist:

• Test suite passes (npm run test)
• Provide changelog for relevant changes (e.g. bug fixes and new features) if applicable.
• Changes are submitted to the appropriate branch (e.g. features should be submitted to feature branch and others should be submitted to main branch)

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