[FEATURE] Add Function Calling to Amazon Bedrock integration

[rossturner]

Is your feature request related to a problem? Please describe.
I wish to make use of function-calling/tools with models provided via Amazon Bedrock such as the Mistral and Anthropic models. LangChain4j has support for function calling when using these models via their own API, but not via Amazon Bedrock.

Describe the solution you'd like
Currently supplying ToolSpecifications via ChatLanguageModel.generate when the underlying implementation is a BedrockChatModel throws an exception as this is not yet implemented. Ideally it would be implemented and convert the supplied ToolSpecification in the format expected by the model.

Describe alternatives you've considered
The obvious alternative of using the Mistral or Anthropic integration is not viable as my company is mandating that we use Amazon Bedrock.