feat: add option to limit max number of processes

[RaczeQ]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.04%. Comparing base (c38ce3f) to head (c90b649).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
overturemaestro/_parquet_multiprocessing.py	66.66%	2 Missing ⚠️
overturemaestro/data_downloader.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   83.40%   82.04%   -1.37%     
==========================================
  Files          13       13              
  Lines         874      880       +6     
==========================================
- Hits          729      722       -7     
- Misses        145      158      +13     

Flag	Coverage Δ
macos-13-python3.12	82.23% <62.50%> (-1.37%)	⬇️
ubuntu-latest-python3.10	82.11% <62.50%> (-1.49%)	⬇️
ubuntu-latest-python3.11	82.23% <62.50%> (-1.37%)	⬇️
ubuntu-latest-python3.12	82.23% <62.50%> (-1.37%)	⬇️
ubuntu-latest-python3.9	82.04% <62.50%> (-1.37%)	⬇️
windows-latest-python3.12	82.23% <62.50%> (-1.37%)	⬇️

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