gh_covering should provide geohash name as a variable

[dshkol]

Right now using gh_covering only stores geohash names as the rownames attribute. In practice, I find that everytime I use gh_covering, I follow it up like this:

gh_covering(spatial_object, precision = 4) %>% 
  mutate(gh = rownames(.))

Three possible solutions:

1. Currently the ID variable returns a numeric index. Can replace this with the geohash name as ID as default behaviour
2. Keep the ID variable and add a gh variable with the name as default behaviour
3. Do 1/2 if specified with an argument, e.g. labelled = TRUE in the function call

[dshkol]

Just came here to open this exact same issue 🤦