Make all layers broadcastable

[tpoisot]

Closes #99

[github-actions]

Documentation for this PR at https://poisotlab.github.io/SpeciesDistributionToolkit.jl/previews/PR103/

[codecov-commenter]

Codecov Report

Base: 37.27% // Head: 36.72% // Decreases project coverage by -0.54% ⚠️

Coverage data is based on head (3affaf2) compared to base (b4f772c).
Patch coverage: 37.28% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   37.27%   36.72%   -0.55%     
==========================================
  Files          36       36              
  Lines        1234     1266      +32     
==========================================
+ Hits          460      465       +5     
- Misses        774      801      +27     

Flag	Coverage Δ
unittests	36.72% <37.28%> (-0.55%)	⬇️

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

Impacted Files	Coverage Δ
SimpleSDMLayers/src/interfaces/broadcast.jl	20.45% <20.45%> (-48.78%)	⬇️
SimpleSDMLayers/src/lib/overloads.jl	76.23% <71.42%> (+0.48%)	⬆️
SimpleSDMLayers/src/interfaces/iteration.jl	37.50% <100.00%> (-6.09%)	⬇️
SimpleSDMLayers/src/lib/types.jl	100.00% <100.00%> (ø)
SimpleSDMLayers/src/operations/mosaic.jl	96.55% <100.00%> (ø)
SimpleSDMLayers/src/operations/mask.jl	5.26% <0.00%> (+5.26%)	⬆️

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