feat: add gen commands

[angeloashmore]

Resolves: #19

Description

Re-enables codegen as the prismic gen types command. This generates TypeScript types from local custom type and slice models using prismic-ts-codegen.

Also refactors generateAndWriteTypes to accept an output URL instead of projectRoot, letting callers control the output path directly.

prismic gen types is used over something like prismic codegen since we may want to add other gen commands, like:

• prismic gen routes
• prismic gen page-file blog-post
• prismic gen simulator

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

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Note

Medium Risk
Moderate risk: introduces new CLI command wiring and changes the generateAndWriteTypes API, which could affect all call sites that generate prismicio-types.d.ts if output paths or URLs are incorrect.

Overview
Adds a new prismic gen command group with prismic gen types to generate prismicio-types.d.ts from local customtypes/ and slices/ models, printing the generated file’s relative path.

Refactors generateAndWriteTypes to accept an explicit output URL (instead of projectRoot) and updates init and sync to pass the output file URL. Adds relativePathname URL utility, new Vitest coverage for the gen/gen types help output and type generation, and adjusts vitest.config.ts to set testTimeout per project.

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