Download, create, and populate source table for police precincts and school districts

[pratishta]

Acceptance criteria

• Update the minio/download.ts file to include the source file census data (this should be in DO under edm-recipes/datasets)
• Convert shape files into csvs shp/convert.ts
• Update pg/source-create/create.ts to include police_precinct and school_district. Write the sql files to create the actual tables
• Update pg/source-load/load.ts to populate table. Run pg:source:load and test to ensure that the source tables are populated

[pratishta]

Because these are stored as parquet files, this ticket is also a bit of a spike to have data-flow handle parquet files

[pratishta]

Okay, I've looked at two ways we could handle parquet files (both suggestions courtesy of DE):

1. pg_parquet, a postgres extension
   The basic installation for this involved building the extension from source, which was 1) taking a long time and 2) confusing as to where and why it's hanging/taking a long time. I have not even been able to build the extension locally with my postgres version.
2. duckdb, a nodejs api to use duckdb
   For this path, I installed the package, created a duckdb instance to connect to my local postgres database, and used read_parquet to create source tables and insert values from the parquet file. A small limitation is that the geometry type in duckdb is slightly limited (e.g. can't store srid) so it's something to keep in mind when creating the source tables for parquet files.

I am now working on a branch to test out automatically organizing the files depending on their type and which method to generate the source tables.