Make it easier to read / filter out logs

[gajus]

At the moment, every query produces at least 2 log entries:

• executing query
• query execution result

The problem:

• "executing query" is not particularly useful most of the time, unless you are debugging hanging queries.
• "query execution result" is not particularly useful without "execution query" because it does not contain the query itself, just the query execution ID.

Desired Behavior

Include the actual query into "query execution result".

Motivation

This way, I could filter only by "query execution result" and still have all the necessary context.

Considerations

• This will increase log weight
• This doesn't entirely address the underlying problem that I was trying to solve, which is to reduce Datadog logs that we index. If we were to exclude "executing query" log entry, then this would miss valuable information, such as queries that started, but may not have completed during the session.

[janpaepke]

potentially related for considerations: #561