Support for AWS SSO Authentication in Bedrock Model Provider

[ODENSUKI]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I would like to see support for AWS SSO authentication in Bedrock. Specifically, I would like an input field for the SessionToken in the Bedrock model provider interface.
This feature will expand the usability of Bedrock by supporting AWS SSO authentication.

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.