Return RequestID for each Bedrock Model call

[ucegbe]

Checked

• I searched existing ideas and did not find a similar one
• I added a very descriptive title
• I've clearly described the feature request and motivation for it

Feature request

When I make a call to Bedrock using Langchain it would be great to get the request ID for traceability with whats logged on the AWS side. Currently I do not see an option to get the request ID return by the Langchain Bedrock client.

Motivation

The motivation for this is to increase traceability of Bedrock Langchain calls by logging requestID for each user calls.

Proposal (If applicable)

If the response metadata from the underlying AWS SDK (boto3, etc.) can be returned back with from langchain and give the user teh ability to reference that metadat request ID that would be apt!