How to turn on vlog for a specific file?

The `-v` flag can be used to enable vlog messages across all files, but is it possible to enable only for a specific file(s)? I think the C++ logging library uses `--vmodule` but there's no such flag for Python, even though a comment in the code says it should be possible: https://github.com/abseil/abseil-py/blob/master/absl/logging/__init__.py#L53

(BTW it'd be great to document the `-v` flag somewhere, it took me a while to figure that one out.)

Look at absl/logging/__init__.py around line 53 to understand the vlog mechanism and the comment about --vmodule. Check how the C++ library implements vmodule and see if a similar flag can be added to the Python logging setup. Test by modifying the argument parsing and logging configuration to accept a vmodule-like flag that filters vlog messages by file.

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