fix(table): the header radius need fit the container in some case

[noootwo]

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

Table组件目前的header的两脚没有完全贴合container，如图

Solution

给container设置了overflow: hidden
去掉了滚动时左右阴影的border-radius

How is the change tested?

运行修改后的项目文档可验证

Changelog

Component	Changelog(CN)	Changelog(EN)	Related issues
Table	优化了表格组件边框样式	beautify the border style of table

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

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[KanekiYuto]

期待合并该项目，我也确实需要它