Add duration time for the execute command

[daliboris]

Enhancement

Some commands, for instance upload, shows the duratoin in the output, for example Created 0 collections and uploaded 1 resources in 292ms.

In the case of execute command, I'm missing this information.

I'm debugging the indexing routine by modifying the indexes and input data. I repeat the same command with different data (collection.xconf, index.xql, input.xml): xst execute "xmldb:reindex('/db/apps/teilex0-publisher/data/playground')" --config admin.xstrc.

Duration of the task is significant for my case.

Alternatives

I run the command using xst and watch the INFO in the eXist-db log.

[line-o]

I think getting timings on query execution is a useful addition @daliboris
Couple of thoughts on the details:

1. I prefer to stats similar to what eXide returns
   • compilation time
   • execution time
   • not have the timings include network transport (the overall time that upload reports)
2. I prefer to have these timings only being output when a flag is set on the command line (e.g. --stats)
   For a lot of use-cases, where you want to work with the returned result, additional output would be problematic
   and this would break those.