[FEATURE] Bedrock prompt caching

[marcofranssen]

📋 Prerequisites

• I have searched the existing issues to avoid creating a duplicate
• By submitting this issue, you agree to follow our Code of Conduct

📝 Feature Summary

Add support for Bedrock prompt caching

❓ Problem Statement / Motivation

While testing #1870 I also stumbled on following documentation:

• https://docs.aws.amazon.com/bedrock/latest/userguide/claude-messages-extended-thinking.html#claude-messages-extended-thinking-prompt-caching
• https://docs.aws.amazon.com/bedrock/latest/userguide/prompt-caching.html

💡 Proposed Solution

Add support for prompt caching to reduce cost. Also see here for the initial issue #1721 which got partially resolved in
#1732 but was buggy see #1870

🔄 Alternatives Considered

No response

🎯 Affected Service(s)

Not Sure

📚 Additional Context

N.A.

🙋 Are you willing to contribute?

• I am willing to submit a PR for this feature