Enhance debug tool to create a visual graph of compaction log DAG

There was a major concerns "Having a network call that generates a file on the server is strange." raised in PR. Discussion: https://github.com/apache/ozone/pull/5061#issuecomment-1638781980.

This concern can be addressed if we can convert this API call to either return graph POJO or stream the file to the client.

This task is to compare the above solution and enhance the tool.