refactor: reuse shared setHttpAgent utility in DynamoDB module

[rafaelmatsumotomb]

Summary

The DynamoDB module (lib/dynamo/index.js) has its own setupHTTPAgent function that duplicates the HTTP agent setup logic already available in the shared setHttpAgent utility (lib/utils.js).

This duplication was introduced when adding support for http.Agent on non-HTTPS endpoints (e.g., local DynamoDB). The same logic already exists in lib/utils.js and is used by the SQS module.

Proposed Changes

• Update setHttpAgent in lib/utils.js to handle both string endpoints ('http://localhost:8000') and AWS.Endpoint objects ({ protocol: 'http:' })
• Refactor lib/dynamo/index.js to remove the duplicated setupHTTPAgent and delegate to the shared setHttpAgent
• Add test coverage for string endpoint handling in utils.spec.js

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