perf_hooks: refactor perf_hooks for snapshot building

- Move Performance and InternalPerformance to a new
  lib/internal/perf/performance.js
- Move now() getMilestoneTimestamp() into
  lib/internal/perf/utils.js
- Rename lib/internal/perf/perf.js to
  lib/internal/perf/performance_entry.js
- Refresh time origin at startup (this means the
  time origins could differ between snapshot building
  time and snapshot creation time)

PR-URL: https://github.com/nodejs/node/pull/38971
Refs: https://github.com/nodejs/node/issues/35711


Reviewed-By: James M Snell <jasnell@gmail.com>