SDT next release - focus on spatial cross-validation

[tpoisot]

Closes #566
Closes #548

This will be v1.9 - many new additions here, including

• tessellate to split objects into tiles
• spatialfold for spatial CV
• variogram for any quantitative layer
• additions and fixes to mosaic and byzone

Also includes a new tutorial on spatial cross-validation

[github-actions]

Documentation websites for this pull request
📦 SpeciesDistributionToolkit
🌿 GBIF
📊 Fauxcurrences
🐾 OccurrencesInterface
🗺 SimpleSDMLayers
❇️ SimpleSDMPolygons
💾 SimpleSDMDatasets
✏️ Phylopic
🕳️ PseudoAbsences
🧠 SDeMo

[codecov-commenter]

Codecov Report

❌ Patch coverage is 1.97368% with 298 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.39%. Comparing base (f3040ce) to head (6413656).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/variogram.jl	0.00%	73 Missing ⚠️
src/tessellation/spatialfold.jl	0.00%	56 Missing ⚠️
src/tessellation/tessellate.jl	0.00%	44 Missing ⚠️
src/tessellation/hexagons.jl	0.00%	39 Missing ⚠️
src/tessellation/triangles.jl	0.00%	36 Missing ⚠️
src/tessellation/squares.jl	0.00%	26 Missing ⚠️
src/polygons/mosaic.jl	0.00%	12 Missing ⚠️
src/polygons/zonal.jl	0.00%	12 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f3040ce) and HEAD (6413656). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (f3040ce)	HEAD (6413656)
unittests	3	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #571      +/-   ##
==========================================
- Coverage   57.99%   51.39%   -6.60%     
==========================================
  Files          90       96       +6     
  Lines        2271     2574     +303     
==========================================
+ Hits         1317     1323       +6     
- Misses        954     1251     +297     

Flag	Coverage Δ
unittests	51.39% <1.97%> (-6.60%)	⬇️

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