feat: support get_many with unknown key

[ChopinXBP]

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feat: support get_many with unknown key

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get_many 相关方法支持入参中存在未知路径

More detailed description for this PR(en: English/zh: Chinese).

This PR enhances and break change the get_many function to handle unknown keys gracefully. The function now returns a Result<Vec<Option<LazyValue>>> instead of Result<Vec<LazyValue>>, allowing it to represent unknown keys as None values. This change improves the flexibility and robustness of the function, especially when dealing with dynamic or partially unknown JSON structures.

Breaking Changes:

• Updated the return type from Result<Vec<LazyValue>> to Result<Vec<Option<LazyValue>>>.
• Modified the function behavior to return None for unknown keys instead of throwing an error.

This enhancement allows users to query for multiple fields, including potentially unknown ones, without causing errors for missing keys. It provides a more flexible way to handle varying JSON structures in a single operation.

允许 get_many 相关方法的入参中存在未知路径。

不兼容变更：

1. 当前方法的返回值类型是 Result<Vec<Option<LazyValue>>> ，变更前为 Result<Vec<LazyValue>>
2. 当入参的某个路径在 Json String 中不存在时，当前方法会以 None 值在 Vec 中返回，变更前调用方法会直接错误并返回失败

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