[strace/strace] Feature request: Print process info on joining to a PID or spawning a new process (#156)

[Igor Zhbanov]

Currently when you are attaching to several processes, it is hard to find later what these processes are, what privileges they have, what open file descriptors they inherited, etc. It could be useful to print some process information summary on joining ne PID and on the forking/cloning. The most interesting information (from my point of view) is:
- UIDs,
- GIDs,
- supplementary groups,
- capabilities (effective and permitted),
- open file descriptors,
- command line and executable name.

So when you start to read a tracing log, it would be easier to understand the starting state.

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