Make graphman query more usable

[lutter]

I was using graphman query to look at performance for some queries and got very annoyed with the amount of log spam it produces. This PR changes the following:

• the query result now goes into a file given with --output
• the query trace can be saved in a file given with --trace (the file format is sorta janky, but good enough to fish out individual SQL queries)
• the command output is now actually readable
• you still need to turn on logging by setting GRAPH_LOG_QUERY_TIMING=gql,sql; untangling that is surprisingly complicated

Example of using it:

> GRAPH_LOG_QUERY_TIMING=gql,sql  graphman query "<deployment>" "<query>"

 root                                                2759ms
  liquidityPools                                       404ms [     50 entities]
    fees                                               202ms [    150 entities]
    inputTokens                                        609ms [    100 entities]
    rewardTokens                                       190ms [     31 entities]
      token                                            191ms [      1 entities]

query:         1598ms
other:         1160ms
total:         2759ms