Update how spatial schemas are managed; update zone schema to add spatial index

[greg-does-weather]

What does this PR do? 🛠️

This PR modifies how we manage our spatial data schemas and data. The various spatial-data/sources file are all updated accordingly.

• source modules export a single object that identifies the involved table, a list of schema upgrades, and a function for loading data
  • the keys for the schema upgrades is a schema version
  • the values for schema upgrades is a function that makes any necessary schema mutations and returns true if source data should also be reloaded or false if the schema modification is sufficient on its own
• the meta module is updated accordingly
• a new schema module is added to handle migrating schemas
• the main load-shapefile.js file is modified to be source-agnostic; it can rely on each source plus the schema migration module to handle themselves

Overall, this PR should make zone-based spatial queries a little faster, but it should also make it easier and faster to make schema-only updates to spatial data.

• closes Zones table is missing spatial key #1490

[eric-gade]

Works 👍 and I like the design. You're welcome, future us.

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[greg-does-weather]

I've run this migration against my own environment and it went smoothly. Running it on staging next, and if that goes well, I'll run it on beta.

@loganmcdonald-noaa Can you update design?

git checkout main
git pull
cf login --sso -a api.fr.cloud.gov
./scripts/load-spatial-data.sh design

@eric-gade Can you update your environment?

git checkout main
git pull
cf login --sso -a api.fr.cloud.gov
./scripts/load-spatial-data.sh eric