[Feature Request]: Support user providing value for a head slot before the prompt (DatePicker)

[hisunnymay]

Is there an existing issue for this?

• [X] I have searched the existing issues

Summary

支持 user 在 bot 询问前主动为 frame slot 中的 head slot 提供 value。 测试文档：https://naturali-io.feishu.cn/docx/Vzogd759Ioo8uDx00sQc66UAnih

比如在 table reservation 的 MakeReservation 场景下：

• 期望对话：

  User：Book a table on Friday. Bot: Date is Friday, Februray 10, 2023.

• 目前对话:

  User：Book a table on Friday. Bot: Which day will you be joining us on? User: Friday Bot: Date is Friday, Februray 10, 2023.

Motivation

如上述对话可见，支持该功能能在用户主动提供 value 的情况下，减少对话轮次，为用户节约时间

Describe alternatives you've considered

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Additional context

相关 issue: [Feature Request]: Support intent expression speaks nested frame slot

[hisunnymay]

Check, it's done.