bedrock tool use with structured output

[JV-DM]

• Adds a :structured_output_strategy option to LlmComposer.Providers.Bedrock (:native default, :tool_use opt-in) that forces the model to call a synthesized structured_response tool built from :response_schema, so response_schema can work on models without native structured-output support.
• Parser unwraps the structured_response tool call's arguments into main_response.content and strips it from function_calls, preserving any other genuine tool calls made in the same turn.

Need this to run the email summary llm - this will allow bedrock models to work with tools and strucutred outputs

PD: I am not sure if this is the best approach, im open to suggestions

[sonic182]

document the new option to use one way or another way of tools definition pls, in Bedrock module maybe?

[JV-DM]

document the new option to use one way or another way of tools definition pls, in Bedrock module maybe?

I added some documentation regarding this

[sonic182]

update CHANGELOG.md