Add bda nova example

[Julia-Bobo-Hu]

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[sharonxiaohanli]

Great work! I briefly took a look at the PR. the blocking comment is that it's using mistral and claude models in the pattern. Showcasing flexibility of model choice is more of a Bedrock value prop. This repo is meant to focus on Nova models best practices. Can you try use Nova models alone or maybe the bedrock github repo is a better fit.