[KV Feedback]: Deno.cron name can use unicode

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### Type of feedback

Feature request

### Description

cron的名称不能使用unicode字符(例如中文)或一些特殊字符(例如./),希望可以放开限制或者增加一个displayName字段。

The name of cron cannot use unicode characters (such as Chinese) or some special characters (such as ./), and it is hoped that the restriction can be relaxed or a displayName field can be added.

### Steps to reproduce (if applicable)

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### Expected behavior (if applicable)

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### Possible solution (if applicable)

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### Additional context

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Start at the Deno.cron API and locate the validation that rejects Unicode and characters such as ./ in cron names. Clarify whether the desired behavior is relaxed names or a separate displayName field, then define the accepted behavior and verify it with the relevant validation tests.

Written by the indexing model from the issue text.