Add repeats to spatial_leave_location_out_cv()

[mikemahoney218]

Fixes #118

library(spatialsample)
data(ames, package = "modeldata")
ames_sf <- sf::st_as_sf(ames, coords = c("Longitude", "Latitude"), crs = 4326)
spatial_leave_location_out_cv(
  ames_sf,
  Neighborhood,
  v = 2,
  repeats = 2
)
#> #  2-fold spatial leave-location-out cross-validation 
#> # A tibble: 4 × 2
#>   splits              id   
#>   <list>              <chr>
#> 1 <split [1036/1894]> Fold1
#> 2 <split [1894/1036]> Fold2
#> 3 <split [1052/1878]> Fold3
#> 4 <split [1878/1052]> Fold4

^{Created on 2022-11-18 by the reprex package (v2.0.1)}

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