Feature request: Add support for Amazon Bedrock prompt caching

[DEG-7]

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Hey team, there's good news from AWS bedrock!! It now supports prompt caching for Anthropic and Nova models, and will certainly be a must have for those who use these models in AWS (due to important cost savings).

Here is the official documentation: https://aws.amazon.com/bedrock/prompt-caching/ https://docs.aws.amazon.com/bedrock/latest/userguide/prompt-caching.html

Thank you for all the effort put into this project. Regards