Handle streaming on Agent with toolConfig enable

[hghandri]

**Issue number:#49

Summary

I simply adapted the code with documentation around bedrock converse stream.

Cf documentation : https://docs.aws.amazon.com/bedrock/latest/userguide/tool-use-examples.html

Changes

Please provide a summary of what's being changed

User experience

Please share what the user experience looks like before and after this change

Checklist

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• I have performed a self-review of this change
• Changes have been tested
• Changes are documented

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[brnaba-aws]

Thanks for providing this fix!