Output trace to STDOUT

Hi,

I'm trying baler in a Docker container, and I have infinite spinner with the message `(Magento/luma) Create core bundle file`. It looks like the baler does not do anything, and I want to enable a verbose mode or tracing.

This can be done with `--trace` CLI argument; however, the filename is generated based on current datetime, and I'd like to be able to specify the trace file name. In my case it's `/dev/stdout`.

Please add a parameter with the trace filename.

Start by locating the CLI handling for `--trace` and the code that generates the current-datetime trace filename. Reproduce the Docker or Magento/Luma case if available, then verify that a supplied filename such as `/dev/stdout` is accepted while the existing default trace behavior still works.

Written by the indexing model from the issue text.