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feat: add processinfo index, add externalId (#1055)

If a NYC_PROCESSINFO_EXTERNAL_ID environment variable is set, then it is
saved in the processinfo as `externalId`.

Furthermore, when this file is generated, some additional helpful
metadata is memoized to the processinfo json files, to minimize the cost
of repeated generation.  (This isn't necessarily a breaking change, but
it is an update to the de facto schema for those files.)

As soon as possible, index generation and process tree display should be
migrated out to a new 'istanbul-lib-processinfo' library.

This opens the door to add features in the v14 release family to improve
support for partial/resumed test runs and file watching.

- When a process is run with --clean=false and a previously seen
  externalId, clear away all the coverage files in the set for that
  externalId.
- When a file is changed, a test runner can use the index to determine
  which tests (by externalId) ought to be re-run.
- Adds a NYC_PROCESS_ID to environment
- Adds `parent` to processInfo object, a uuid referring to parent.
- Rebase onto processinfo-numeric-pids branch
- Avoid re-writing the processinfo/{uuid}.json files
- Update process tree output to rely on process index instead of
  duplicating effort.

BREAKING CHANGE: This adds a file named 'index.json' to the
.nyc_output/processinfo directory, which has a different format from the
other files in this dir.

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