Should we support OpenAI explicit caching

### Overview

Recent models from OpenAI support explicit caching: https://developers.openai.com/api/docs/guides/prompt-caching#prompt-cache-breakpoints

### Motivation

Can it improve caching?

### Use cases

_No response_

### Proposed solution

_No response_

### Alternatives

_No response_

### Related issues

_No response_

### Additional context

_No response_