Fix blockCV::spatialBlock() functions

[pat-s]

fixes #92

The linked issue also revealed that some other {blockCV} function settings were not reproducible with {ml3spatiotempcv}.
This should now be fixed and protected by a test.

In addition this PR fixes an issue with the recently added support for {sf} objects: coordinates names from sf objects are now retrieved dynamically.
Before some functions would have errored if the coordinate names were not named "x" and "y".

library(mlr3spatiotempcv)
library(mlr3)
library(blockCV)
library(sf)
#> Linking to GEOS 3.9.1, GDAL 3.2.1, PROJ 7.2.1

set.seed(123)
x <- runif(5000, -80.5, -75)
y <- runif(5000, 39.7, 42)

data <- data.frame( # spp="test",
  label = factor(round(runif(length(x), 0, 1))),
  x = x,
  y = y
)

testSF <- st_as_sf(data[, c("x", "y", "label")],
  coords = c("x", "y"),
  crs = "EPSG: 4326"
)

# mlr3spatiotempcv
testTask <- TaskClassifST$new(
  id = "test",
  backend = testSF,
  target = "label",
  positive = "1"
)

blockSamp <- rsmp("spcv_block",
  # folds = 1,
  range = 50000,
  selection = "checkerboard"
)
blockSamp$instantiate(testTask)

# blockCV
testBlock <- suppressMessages(suppressWarnings(spatialBlock(
  speciesData = testSF,
  theRange = 50000,
  selection = "checkerboard",
  showBlocks = FALSE,
  verbose = FALSE
)))

print(all.equal(blockSamp$instance$fold, testBlock$foldID))
#> [1] TRUE

^{Created on 2021-03-10 by the reprex package (v1.0.0)}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
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#>  date     2021-03-10                                 
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