gwb-grid: support for filtering cells

[tjhei]

Add a new option --by-tag that enables filtering of cells inside gwb-grid. To actually do something useful, we need support inside GWB to provide tag information. So, right now, this option randomly selects some cells to be shown.

[codecov]

Codecov Report

Attention: 41 lines in your changes are missing coverage. Please review.

Comparison is base (684b28a) 93.11% compared to head (9197223) 92.56%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #585      +/-   ##
==========================================
- Coverage   93.11%   92.56%   -0.56%     
==========================================
  Files          92       92              
  Lines        6334     6375      +41     
==========================================
+ Hits         5898     5901       +3     
- Misses        436      474      +38     

Files	Coverage Δ
source/gwb-grid/main.cc	44.55% <10.86%> (-2.44%)	⬇️

... and 2 files with indirect coverage changes

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	1.014 ± 0.007 (s=463)	1.014 ± 0.004 (s=427)	-0.0% .. +0.2%
Slab interpolation curved simple none	1.016 ± 0.003 (s=457)	1.015 ± 0.005 (s=432)	-0.1% .. +0.1%
Spherical slab interpolation simple none	1.167 ± 0.006 (s=371)	1.169 ± 0.005 (s=402)	+0.0% .. +0.3%
Slab interpolation simple curved CMS	1.058 ± 0.007 (s=417)	1.055 ± 0.006 (s=437)	-0.4% .. -0.1%
Spherical slab interpolation simple CMS	1.549 ± 0.009 (s=295)	1.549 ± 0.010 (s=288)	-0.1% .. +0.2%
Spherical fault interpolation simple none	1.171 ± 0.006 (s=394)	1.172 ± 0.008 (s=377)	-0.0% .. +0.2%
Cartesian min max surface	2.311 ± 0.026 (s=208)	2.308 ± 0.024 (s=184)	-0.5% .. +0.2%
Spherical min max surface	7.227 ± 0.033 (s=70)	7.230 ± 0.026 (s=57)	-0.2% .. +0.3%

[tjhei]

This is ready for review @MFraters

[MFraters]

I have some questions about the structure, but that is probably because it is not actually using the tags yet. I think it is probably best to merge it as is, and then we can discuss those things when it is ready to do the actual filtering.

[MFraters]

Or do you want to do everthing in this pull request, given that it is still marked as [wip]?

[tjhei]

Let me make a few updates...

[tjhei]

Okay, this is now ready to review and merge. I do not advertise the new option in --help yet, because it only filters tag -1 for now. I will follow up with additional PRs later. @MFraters