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