PostGIS Tiger: Data not loaded to use geocode function

# Feature request ## Is your feature request related to a problem? Please describe. I have enabled to `POSTGIS_TIGER_GEOCODER`, but whenever I use the its geocoding functionality no results are returned. I believe this is because while the extension is enabled, the census data it uses to geocode is not loaded. See the PostGIS Tiger docs for more info: http://postgis.net/docs/postgis_installation.html#install_tiger_geocoder_extension. The query I'm using to test is: ``` select tiger.geocode('... my address ...'); ``` which returns ``` geocode --------- (0 rows) ``` ## Describe the solution you'd like Documentation on how to load the census data and/or automatically loading it when enabling the extension. ## Describe alternatives you've considered ## Additional context