Add support for rasterLayer argument in blockCV::spatialBlock()

[pat-s]

fixes #92

[codecov-io]

Codecov Report

Merging #94 (9626467) into main (07fcb7e) will decrease coverage by 21.97%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##             main      #94       +/-   ##
===========================================
- Coverage   99.75%   77.78%   -21.98%     
===========================================
  Files          22       22               
  Lines        1244     1256       +12     
===========================================
- Hits         1241      977      -264     
- Misses          3      279      +276     

Impacted Files	Coverage Δ
R/autoplot.R	45.05% <ø> (-54.95%)	⬇️
R/ResamplingRepeatedSpCVBlock.R	100.00% <100.00%> (ø)
R/ResamplingSpCVBlock.R	100.00% <100.00%> (ø)
R/helper.R	0.00% <0.00%> (-100.00%)	⬇️
R/ResamplingRepeatedSptCVCluto.R	22.22% <0.00%> (-77.78%)	⬇️
R/ResamplingSptCVCluto.R	25.00% <0.00%> (-75.00%)	⬇️
R/ResamplingRepeatedSptCVCstf.R	85.29% <0.00%> (-14.71%)	⬇️
R/ResamplingSptCVCstf.R	98.03% <0.00%> (-1.97%)	⬇️

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