AWS Bedrock API Endpoint Update: /v1/models support added

AI Impact Summary

This pull request updates the client library to reflect the recent change in the AWS Bedrock endpoint from the deprecated URL to the new /v1/models endpoint. The update includes functionality for listing available models via the Bedrock API, addressing a gap in the existing functionality. This change requires updating all clients that interact with Bedrock to utilize the new endpoint and model listing capabilities.