feat: create mesh in fewer iterations

[drbh]

Hi @gumyr thank you for this awesome library!

this PR includes some small changes to the meshing logic that greatly improve the export speed for a couple of toy projects I'm working on (300K+ vertices), and wanted to share it as it may be helpful to others.

with change

Number of vertices	Time (s)
100	0.003
1000	0.002
10000	0.014
100000	0.215

without change

Number of vertices	Time (s)
100	0.004
1000	0.007
10000	0.509
100000	58.602

additional this PR adds a small test to ensure that 100K vertices always take less than 1 second.

pytest tests/test_mesher.py -v
# tests/test_mesher.py::InternalApiBenchmark::test_create_3mf_mesh PASSED

Please let me know if I should make any changes, and thanks again! 🙏

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.40%. Comparing base (5f7dfc2) to head (9e6bc2d).
Report is 21 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #868      +/-   ##
==========================================
- Coverage   96.49%   96.40%   -0.10%     
==========================================
  Files          31       31              
  Lines        9080     9112      +32     
==========================================
+ Hits         8762     8784      +22     
- Misses        318      328      +10     

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[drbh]

just attempted to run mypy on both dev and this branch and they both seem to return the type issue so I'm not sure if these changes introduced the CI issue..

[gumyr]

Thanks! 300K vertices - that's a very large model. This change will be very helpful those that dream big.