[chore] Use int64 for queue_size in the queuebatch.Config, simplifies conversions

[bogdandrutu]

No description provided.

[songy23]

This depends on other PRs?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.58%. Comparing base (540d6ed) to head (5749d6e).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12745   +/-   ##
=======================================
  Coverage   91.58%   91.58%           
=======================================
  Files         479      479           
  Lines       26484    26484           
=======================================
  Hits        24255    24255           
  Misses       1757     1757           
  Partials      472      472           

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