Node 18 upgrade improvements

[fregante]

I just saw a couple node Node 18-related notes in the code. I'll add a couple more:

• Add support for cause in TimeoutError, even if unused locally
  • Rule proposal: prefer-error-cause eslint-plugin-unicorn#1342
• Use public fields instead of the constructor (this actually fixes the above issue automatically too)
  • custom-error-definition incompatible with instance class field + broken autofix eslint-plugin-unicorn#1993
• Ensure that the type for TimeoutError matches these changes, since d.ts file is maintained manually

[silverwind]

For custom errors, the V8-specific Error.captureStackTrace might be nice for a cleaner stack trace. Call it with ?. so it does not fail on non-V8.