Test for clipping with natural coordinates

[gabrieldansereau]

Fixes #149 as the test (and the clipping call) works for exact natural coordinates.

However, we have an example right in the test of a clip with a Float that returns an approximation error:

julia> M = rand(Bool, (10, 10));
       S = SimpleSDMPredictor(M, 0.0, 1.0, 0.0, 1.0);
       cl1 = clip(S; left=0.2, right=0.6, bottom=0.5, top=1.0)
SDM predictor → 5×4 grid with 20 Bool-valued cells
  Latitudes     0.5 ⇢ 1.0
  Longitudes    0.2 ⇢ 0.6000000000000001

I think we should fix clip first, then adapt the test accordingly.

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR152/

[codecov-commenter]

Codecov Report

Base: 47.49% // Head: 53.71% // Increases project coverage by +6.22% 🎉

Coverage data is based on head (737df11) compared to base (a0970e1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
+ Coverage   47.49%   53.71%   +6.22%     
==========================================
  Files          36       47      +11     
  Lines        1196     1493     +297     
==========================================
+ Hits          568      802     +234     
- Misses        628      691      +63     

Flag	Coverage Δ
unittests	53.71% <ø> (+6.22%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...DMDatasets/src/providers/WorldClim/worldclim_v2.jl	92.10% <0.00%> (ø)
...impleSDMDatasets/src/providers/CHELSA/chelsa_v2.jl	90.90% <0.00%> (ø)
SimpleSDMDatasets/src/keychecker.jl	74.13% <0.00%> (ø)
SimpleSDMDatasets/src/types/specifiers.jl	100.00% <0.00%> (ø)
SimpleSDMDatasets/src/interface.jl	63.33% <0.00%> (ø)
...MDatasets/src/providers/CHELSA/chelsa_future_v2.jl	100.00% <0.00%> (ø)
SimpleSDMDatasets/src/downloader.jl	76.66% <0.00%> (ø)
...mpleSDMDatasets/src/providers/EarthEnv/earthenv.jl	86.66% <0.00%> (ø)
...MDatasets/src/providers/CHELSA/chelsa_future_v1.jl	100.00% <0.00%> (ø)
...impleSDMDatasets/src/providers/CHELSA/chelsa_v1.jl	96.55% <0.00%> (ø)
... and 1 more

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