gwb-grid: support tags

[tjhei]

• add tag output field in gwb-grid
• remove a forgotten debug output in continental-plate
• update test output

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (180ea68) 93.12% compared to head (0f52501) 93.15%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #612      +/-   ##
==========================================
+ Coverage   93.12%   93.15%   +0.03%     
==========================================
  Files          92       92              
  Lines        6324     6328       +4     
==========================================
+ Hits         5889     5895       +6     
+ Misses        435      433       -2     

Files	Coverage Δ
source/world_builder/features/continental_plate.cc	100.00% <ø> (+1.12%)	⬆️
source/gwb-grid/main.cc	46.98% <90.00%> (+0.24%)	⬆️

... and 2 files with indirect coverage changes

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	0.969 ± 0.004 (s=449)	1.013 ± 0.005 (s=461)	+4.4% .. +4.6%
Slab interpolation curved simple none	0.973 ± 0.004 (s=454)	1.016 ± 0.005 (s=454)	+4.3% .. +4.5%
Spherical slab interpolation simple none	1.130 ± 0.007 (s=388)	1.169 ± 0.007 (s=397)	+3.3% .. +3.6%
Slab interpolation simple curved CMS	1.010 ± 0.005 (s=449)	1.053 ± 0.007 (s=426)	+4.1% .. +4.4%
Spherical slab interpolation simple CMS	1.510 ± 0.011 (s=303)	1.549 ± 0.016 (s=288)	+2.3% .. +2.8%
Spherical fault interpolation simple none	1.133 ± 0.006 (s=381)	1.173 ± 0.010 (s=402)	+3.3% .. +3.7%
Cartesian min max surface	2.172 ± 0.024 (s=203)	2.317 ± 0.044 (s=201)	+6.1% .. +7.2%
Spherical min max surface	6.932 ± 0.028 (s=62)	7.234 ± 0.034 (s=67)	+4.1% .. +4.6%