Collect Additional Process Attributes

[mwear]

I'd like to collecto additional process attributes that are recommended by the spec. It recommends collecting process.owner. It also has a preference for collecting process.command_args over process.command_line. We currently collect the latter. While making these changes, it would not hurt to collect process.executable.path.

The spec has this to say about process.command_args vs process.command_line:

Between process.command_args and process.command_line, usually process.command_args should be preferred. On Windows and other systems where the native format of process commands is a single string, process.command_line can additionally (or instead) be used.

We can keep both, or if we want only one, it should be process.command_args.