Consider support for Amazon Nova models directly through Amazon Bedrock

[micahwalter]

It appears that you currently support Amazon Nova models via OpenRouter, but I'd prefer to use these models directly through Amazon Bedrock the same way I can for Anthropic models.

FYI - I'd be happy to help with this.

[kujtimiihoxha]

@micahwalter thanks for the discussion, and yeah ideally we should support that. We use https://github.com/charmbracelet/fantasy for all providers so we would need to add support there and it should just work in crush.