This lib seems to block event loop

[chrisdostert]

Environment details

• OS: alpine linux
• Node.js version: 14
• @google-cloud/profiler version: 4.0.2

Steps to reproduce

1. start an app with blocked-at and @google-cloud profiler wired up
2. watch logs and you'll see frequent blocking operations logged between 2-8 seconds example:

Blocked for 7586.2085ms, operation started here: [
  '    at Profiler.collectProfile (/src/backend/node_modules/@google-cloud/profiler/src/profiler.ts:393:25)',
  '    at Profiler.runLoop (/src/backend/node_modules/@google-cloud/profiler/src/profiler.ts:379:36)',
  '    at listOnTimeout (internal/timers.js:551:17)',
  '    at processTimers (internal/timers.js:494:7)'
]