This PR adds the possibility of specifying the endpoint URL to AWS in
the DynamoDBChatMessageHistory, so that it is possible to target not
only the AWS cloud services, but also a local installation.
Specifying the endpoint URL, which is normally not done when addressing
the cloud services, is very helpful when targeting a local instance
(like [Localstack](https://localstack.cloud/)) when running local tests.
Fixes#5835
#### Who can review?
Tag maintainers/contributors who might be interested: @dev2049
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Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Rubén Martínez
db7ef635c0