add aws bedrock prompt-caching support

[xxxx3]

add aws bedrock prompt-caching support.
aws url:https://docs.aws.amazon.com/bedrock/latest/userguide/prompt-caching.html

[DEG-7]

Hey @xxxx3, could you also add the cachePoint in the tools definition as it's shown in the same AWS documentation page you shared?
Great work and thank in advance !!

...
toolConfig={
    "tools": [
        {
            "toolSpec": {
                "name": "top_song",
                "description": "Get the most popular song played on a radio station.",
                "inputSchema": {
                    "json": {
                        "type": "object",
                        "properties": {
                            "sign": {
                                "type": "string",
                                "description": "The call sign for the radio station for which you want the most popular song. Example calls signs are WZPZ and WKRP."
                            }
                        },
                        "required": [
                            "sign"
                        ]
                    }
                }
            }
        },
        {
                "cachePoint": {
                    "type": "default"
                }
        }
    ]
}
...

[gpalacios-caylent]

Oh! This will be a great addition

[sobychacko]

Thanks for the PR. As part of adding prompt caching support in Spring AI as a feature from other models, we just revamped the AWS bedrock prompt caching support via another PR. #4614. Closing this PR.