给nz-table的th组件和td组件的selector增加一个选择器，用来和用户自定义的组件做出区别。

[tirelyl]

What problem does this feature solve?

现在的th组件的selector匹配了所有的th标签（td组件也是），希望添加一个选择符，用来跟用户自定义的组件做出区别

What does the proposed API look like?

zorro: selector: 'th(.ant-table-th)',
用户 : selector: 'th:not(.ant-table-th)' or selector: 'th(.xx-xx-xx)'

[lock]

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