Create validator script to ensure packaged atlas meet certain criteria (maybe also with an option to display images for a visual check?)

[adamltyson]

Tasks

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1. validation function checking that all files exist bg-atlasgen#97
   +0
2. validation function for checking that there is 1 mesh file per structure bg-atlasgen#98
   +0
3. validation function checking size of annotation and template image are the same #207
   atlasgen +1
4. validation function checking that root mesh and scaled annotations image roughly match bg-atlasgen#100
   +0
5. checking that files have expected format (internal columns, structure etc)
6. [BUG] Missing areas in structure.json files #173
   bug +1
7. checking binarisation of annotation and template is the same
8. check normals of all meshes are pointing outwards
9. at least one mesh fits inside the root mesh
10. [Feature] Force all atlas 3D meshes to be in consistent "brainglobe" space, aligned to the annotations #213
    atlasgen enhancement +2
11. Visual check that mesh files don't look bad (A lot of the mesh files look really bad (e.g. Waxholm), applying a small amount of non-warping smoothing makes a big difference)
12. Check all annotation IDs in some atlases have a corresponding area in the structure.json file
13. check that atlas is in asr (this is a new design choice - please add to docs)
14. https://github.com/brainglobe/bg-atlasgen/issues/82

[alessandrofelder]

Things we should validate about atlases (from Friday discussion):
[Edit] moved this list to tasklist above.

Some of these ideas courtesy of @dbirman - thank you!