Add [nzPopconfirmContext] support to nz-popconfirm

[crossan007]

What problem does this feature solve?

I'd like to re-use a <ng-template #templateRef> between multiple instances of nz-popconfirm but need to have access to context variables like those produced by *ngFor.

Presently, the nzPopconfirmTitle attribute only allows string | TemplateRef<void>, but I would like to supply string | TemplateRef<any> and pass in additional context to the template

This is nearly identical to the feature request #6607 but for the nz-popconfirm component instead of the nz-tooltip component

What does the proposed API look like?

An additional property is available on html tags having nz-popconfirm which allows passing template context into the template defined by nzPopconfirmTitle

[crossan007]

Also relates to #4706

[zorro-bot]

Hello @crossan007. We totally like your proposal/feedback, welcome to send us a Pull Request for it. Please fill the Pull Request Template here, provide documentation/test cases if needed and make sure CI passed, we will review it soon. Appreciate it advance and we are looking forward to your contribution!

你好 @crossan007, 我们完全同意你的提议/反馈，欢迎直接在此仓库 创建一个 Pull Request 来解决这个问题。请务必填写 Pull Request 内的预设模板，提供改动所需相应的测试用例、文档等，并确保 CI 通过，我们会尽快进行 Review，提前感谢和期待您的贡献！