Task: Implement drizzle custom type and helpers for postgres cube

[iolyd]

Task description

At certain places in the app, image metadata are recorded to the database alongside a palette of extracted color. These colors are extracted at upload time and stored as 3d vectors, enabling color-based queries (e.g. proximity-based and containment-based filtering of projects based on their images). The postgres cube extension's data type is not part of drizzle-orm, we thus need to provide our own for to/from driver data mapping.

List of actions

• [x] Identify key implementation elements in postgres docs (https://www.postgresql.org/docs/current/cube.html)
• [x] Define desired ts typing strategy (union, discriminated union based on config param, etc.?) in accordance to postgres cube's native behavior and ideal DX.
• [x] Implement custom type with adequate typing
• [x] Implement needed cube functions
• [x] Implement needed cube operators

[iolyd]

This is completed through the publication of https://github.com/iolyd/drizzle-orm-helpers.