SageMakerAIModel provider flag for provider-specific formatting.

[dferguson992]

Description

Add a model provider flag to the SageMakerAIModel endpoint configuration. Allows the SageMakerAIModel to use models using non-OpenAI APIs such as Meta's Llama models.

Related Issues

Bug#629

Documentation PR

N/A

Type of Change

Bug fix

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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