Added support for Prompt Caching for Anthropic when using InvokeModel API #356
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Using langchain's example for creating SystemMessage and HumanMessage for prompt caching:
https://js.langchain.com/docs/integrations/chat/anthropic/#prompt-caching
Looks like SystemMessage's content could be non-string, added support for that.
Using AWS Bedrock's InvokeModel API prompt caching example on what message is supposed to structure:
https://docs.anthropic.com/en/docs/build-with-claude/prompt-caching#large-context-caching-example
Doesn't look like
SystemMessagesupports prompt caching, so ignore thecache_control.But preserve that for
HumanMessageAdded tests for the change