chore(bedrock): add Writer's Palmyra X4/X5, Llama 4 Scout 17B/Maverick 17B, and Amazon Nova Premier

[mazyu36]

Ref

• Writer’s Palmyra X5 and X4 models are now available in Amazon Bedrock
  
• Meta’s Llama 4 now available fully managed in Amazon Bedrock
• Amazon Nova Premier: Our most capable model for complex tasks and teacher for model distillation
  
• https://docs.aws.amazon.com/bedrock/latest/userguide/models-supported.html

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[paulhcsun]

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[paulhcsun]

@Mergifyio update

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update

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Pull request has been modified.

[paulhcsun]

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• Commit ID: f9a0e3a
• Result: SUCCEEDED
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