[Issue 1166] Create tables for expanded opportunity data model

[chouinar]

Summary

Fixes #1166

This requires #1136 to be merged first as it builds ontop of that work

Time to review: 5 mins

Changes proposed

Created the opportunity tables for the expanded data model
https://app.gitbook.com/o/cFcvhi6d0nlLyH2VzVgn/s/v1V0jIH7mb7Yb3jlNrgk/engineering/learnings/opportunity-endpoint-data-model#overview

Setup factories to generate data in a reasonable way for these tables

Context for reviewers

This sets up all of the tables for our expanded opportunity data model - tables we'll copy to for DMS that will later be transformed to these tables will be a separate PR.

The factories try to make somewhat realistic data with some variability.

Note that I did adjust a few things from the tech spec, which I just haven't changed in that document yet (can't merge the changes myself)

• The other_value fields in the link tables actually make sense to stay in the summary table, I found examples of them working different than I had assumed, so it makes more sense to keep them in a general place.
• The opportunity_agency table idea I've dropped - if we want to adjust how agency data is stored, will deal with it later when we deal with the rest of the agency data
• Didn't adjust the primary keys - just keeping everything on opportunity_id - already was going to keep several that way - don't see a reason to have several different primary/foreign key setups.
• Miscellaneous small renames to more closely match the design of the front-end

Additional information

Running make db-seed-local after the migrations shows the data in various tables in what I would expect:

[jamesbursa]

Looks good!