[KV Feedback]: Check for keys existence without values

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### Type of feedback

Feature request

### Description

I'm trying to keep a cache fresh without using up my KV reads. Right now whenever I use `get` or `list` I get the value as well which uses up my read quota. Would be great if I could just see if the key(s) are there.

### Steps to reproduce (if applicable)

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### Expected behavior (if applicable)

_No response_

### Possible solution (if applicable)

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### Additional context

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