Support Newer Cohere Models on AWS Bedrock

[skiski456]

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1. Is this request related to a challenge you're experiencing?

When I try to add cohere.command-r-plus-v1:0 as a model using AWS Bedrock, I get an error message ValidationException: Malformed input request: #: required key [message] not found#: extraneous key [stream] is not permitted#: extraneous key [prompt] is not permitted, please reformat your input and try again

2. Describe the feature you'd like to see

Add support for command-r-plus and the other newer cohere models that were recently added to AWS Bedrock (cohere.command-r-plus-v1:0, cohere.command-r-v1:0)

3. How will this feature improve your workflow or experience?

This is the model I installed Dify to use as it is the model that I use locally.

4. Additional context or comments

No response

5. Can you help us with this feature?

• I am interested in contributing to this feature.