Flood Hazard Dataset Build

[ethanelbert22]

Added build.py script for the flood hazard data, as well as info.sql, geom.sql, build.sql, and table_build.qmd to document the process.

[FWJK1]

@ethanelbert22, there's still a lot of work to do here. I filled out the .qmd file a bit more -- please look through the columns and make decisions about which ones to keep, and how to clean them if needed (use values counts, fix nulls, delete columns that don't have any meaningful data, compare to the manual, etc.)

[FWJK1]

Merged in main branch. Just move your flood-hazard/table_build to the notebook folder, and collect_flood.py, in the same place, backend/data_collection, and you can merge.

After that, add a query file for this data set, and you'll be done with it (if you want).

Thanks!