Store enumerated iasWorld column value crosswalks using seeds

[jeancochrane]

We should check our iasWorld docs for enumerated values with human-readable text, e.g. permit improvement codes. Where possible, we should extract the values out into a seed in the ccao schema that we can use as a crosswalk between codes and their human-readable values.

Adapted from https://github.com/ccao-data/data-architecture/pull/597/files#r1761797258:

1. Create a unified schema for storing enumerated column values as seeds
2. Move these existing values to said schema and out of the docs

As a rule of thumb, I'd say anytime a column has more than 5 enumerated values then the values should live in the seed(s), with a pointer from the docs to the seed(s). If <= 5 values, let's keep the enumerated value in the docs and add it to the seed(s).