gitignore: add .cache

[tjhei]

This is used in vscode

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1ae31ff) 93.49% compared to head (2f3fe6a) 93.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #551   +/-   ##
=======================================
  Coverage   93.49%   93.49%           
=======================================
  Files          92       92           
  Lines        6346     6346           
=======================================
  Hits         5933     5933           
  Misses        413      413           

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.024 ± 0.006 (s=475)	1.023 ± 0.003 (s=407)	-0.2% .. -0.0%
Slab interpolation curved simple none	1.028 ± 0.003 (s=412)	1.028 ± 0.006 (s=466)	-0.1% .. +0.1%
Spherical slab interpolation simple none	1.262 ± 0.004 (s=353)	1.262 ± 0.005 (s=363)	-0.1% .. +0.1%
Slab interpolation simple curved CMS	1.095 ± 0.002 (s=406)	1.096 ± 0.006 (s=418)	-0.0% .. +0.2%
Spherical slab interpolation simple CMS	1.860 ± 0.010 (s=228)	1.859 ± 0.006 (s=259)	-0.2% .. +0.1%
Spherical fault interpolation simple none	1.272 ± 0.004 (s=351)	1.272 ± 0.005 (s=359)	-0.1% .. +0.1%
Cartesian min max surface	2.362 ± 0.021 (s=188)	2.363 ± 0.019 (s=195)	-0.2% .. +0.3%
Spherical min max surface	7.548 ± 0.057 (s=56)	7.541 ± 0.026 (s=66)	-0.5% .. +0.3%