Add Prompt Caching Feature for Anthropic and OpenAI clients

[smartinezbragado]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

Add prompt caching features from anthropic and openai:

• https://www.anthropic.com/news/prompt-caching
• https://platform.openai.com/docs/guides/prompt-caching

Motivation

This feature is key to reduce the cost of LLM calls

Proposal (If applicable)

No response