Feat/add endpointhost to AWSChatBedrock

[HenryHengZJ]

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[gemini-code-assist]

Summary of Changes

Hello @HenryHengZJ, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the AWSChatBedrock node by introducing a new configuration option that allows users to specify a custom endpoint host. This feature provides greater flexibility for connecting to AWS Bedrock, accommodating scenarios where a non-default or private endpoint might be required for model interaction.

Highlights

• New Input Parameter: An optional Custom Endpoint Host parameter has been added to the AWSChatBedrock node configuration.
• Custom Endpoint Support: This new parameter allows users to specify a custom endpoint host for AWS Bedrock chat models, overriding the default endpoint if provided.
• Enhanced Flexibility: The implementation ensures that the provided custom endpoint host is used when making calls to the Bedrock service.

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[gemini-code-assist]

Code Review

This pull request adds a new optional endpointHost parameter to the AWSChatBedrock node, allowing users to specify a custom endpoint for the AWS Bedrock model. The implementation is straightforward and correctly adds the new input, reads its value, and conditionally applies it. I've suggested a small improvement to handle user inputs with leading/trailing whitespace to make the feature more robust.