define paramter for reactor thread pool size

[thuvh]

No description provided.

[codecov-commenter]

Codecov Report

Base: 80.29% // Head: 81.60% // Increases project coverage by +1.30% 🎉

Coverage data is based on head (0fcd96b) compared to base (802240c).
Patch coverage: 84.61% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
+ Coverage   80.29%   81.60%   +1.30%     
==========================================
  Files           4        4              
  Lines         873      886      +13     
==========================================
+ Hits          701      723      +22     
+ Misses        172      163       -9     

Impacted Files	Coverage Δ
vmware_exporter/defer.py	97.22% <ø> (ø)
vmware_exporter/helpers.py	72.72% <20.00%> (+11.53%)	⬆️
vmware_exporter/vmware_exporter.py	81.43% <93.93%> (+0.34%)	⬆️
vmware_exporter/__init__.py	100.00% <100.00%> (ø)

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[thuvh]

@pryorda could you plz review this code?