Fix: reduce the default reader and writer thread count

[emmercm]

No description provided.

[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/reduce-default-threads" [commands..] [options]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.38%. Comparing base (45596f8) to head (c2a07c5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1076   +/-   ##
=======================================
  Coverage   93.38%   93.38%           
=======================================
  Files          92       92           
  Lines        6029     6029           
  Branches     1437     1437           
=======================================
  Hits         5630     5630           
  Misses        378      378           
  Partials       21       21           

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[github-actions]

🔒 Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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