feat(tree-select): header and footer visibility in empty data state

[oljc]

Types of changes

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

Background and context

#2429

与下拉框组件更新保持一致，增加对空状态下页头 页脚插槽的显示控制

Solution

How is the change tested?

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
tree-select	增加空状态下 header 和 footer 的显示状态	Add header and footer visibility in empty data state

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)

Other information