lutz: Look Up Time Zones of Point Coordinates
Input latitude and longitude values or an 'sf/sfc' POINT
object and get back the timezone in which they exist. Two methods are implemented.
One is very fast and uses the 'V8' package to access the 'tz-lookup.js' 'Javascript' library
(<https://github.com/darkskyapp/tz-lookup/>). This method also works outside of countries'
borders and in international waters, however speed comes at the cost of accuracy - near time
zone borders away from populated centres there is a chance that it will return the incorrect
time zone. The other method is slower but more accurate - it uses the sf package to intersect
points with a detailed map of time zones from here:
<https://github.com/evansiroky/timezone-boundary-builder/>.
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