Codegen: add --format sqldelight (.sq schema generation)

[AndroidPoet]

What

Extends the codegen with a second output format so it can drive a local SQLDelight database that mirrors the Supabase schema.

SupabaseSqlDelightGenerator turns a PostgREST OpenAPI document into one .sq file per table:

• CREATE TABLE IF NOT EXISTS with Postgres → SQLite storage classes (INTEGER / REAL / TEXT; boolean→INTEGER, money/uuid/timestamps/arrays→TEXT)
• NOT NULL from the schema's required columns
• PRIMARY KEY detected from PostgREST's <pk/> description marker, falling back to an id column
• standard selectAll / selectById / upsert / deleteById queries

SQLDelight's own Gradle plugin then compiles these .sq files into the type-safe Kotlin database — we only generate the schema half.

CLI

Main.kt gains --format kotlin|sqldelight:

• kotlin (default, unchanged) — one @Serializable file per table/enum
• sqldelight — one .sq per table

Each format clears its own stale output before writing.

Why

First step of the Supabase → SQLDelight offline-sync pipeline: our codegen produces the .sq, SQLDelight produces the typed DB. Read-only against the schema, like the existing generator.

Tests

SupabaseSqlDelightGeneratorTest covers file-per-table layout, storage-class mapping, NOT NULL + PRIMARY KEY, the standard queries, and PK fallback. :supabase-codegen:build green (tests + detekt + spotless).

Logged under Unreleased in the changelog — no version bump.