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trace_events: add more process metadata

Rodrigo Muino Tomonari requested to merge github/fork/jasnell/trace-process-metadata into master

Now that TracedValue has landed, add more detailed process __metadata including versions, arch, platform, release detail, and argv/execArgv to the trace event log.

This adds an entry like:

{
  "pid":46021,
  "tid":46021,
  "ts":4996201438,
  "tts":31331,
  "ph":"M",
  "cat":"__metadata",
  "name":"node",
  "dur":0,
  "tdur":0,
  "args":{
    "process":{
      "versions":{
        "http_parser":"2.8.0",
        "node":"11.0.0-pre",
        "v8":"6.7.288.46-node.14",
        "uv":"1.22.0",
        "zlib":"1.2.11",
        "ares":"1.14.0",
        "modules":"64",
        "nghttp2":"1.32.0",
        "napi":"3",
        "openssl":"1.1.0h"
      },
      "arch":"x64",
      "platform":"linux",
      "release":{
        "name":"node"
      },
      "argv":["./node"],
      "execArgv":["--trace-event-categories","node.perf"]
    }
  }
}
Checklist
  • make -j4 test(UNIX), orvcbuild test` (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

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