Publish @minecraft/api-docs-generator and @minecraft/markup-generators-plugin

[zachcampbellskyboxlabs]

This adds @minecraft/api-docs-generator and @minecraft/markup-generators-plugin as well as a test snapshots package under ./tools. Many configuration changes to accommodate the docs generator.

@minecraft/core-build-tasks minor update:

• Updates the publishRelease task to be able to upload a pre-existing NPM tarball by specifying its directory i.e. publishRelease({ artifact: { path: ..., sourceFormat: 'archive' }, ... });
  • This is to avoid creating a release with a double-zipped tarball for the docs generator.
  • Also adds support for specifying a directory other than dist as well as multi-directory support.
  • Existing behaviour when no directory is specified is unchanged, defaults to zipping dist.
• Update package.json to add exports.types, because imports from core-build-tasks in just configs were previously any-typed.

Configuration file updates:

• VSCode settings - Updates settings.json, adds launch.json, tasks.json, with launch tasks for running/testing api-docs-generator, adds extensions.json with extensions for developing with api-docs-generator.
• Update root package.json with test:ci to reduce turbo concurrency on CI (PR feedback), and test:update / lint:fix sub-commands for convenience.
• Update turbo.json.
• Update .gitignore and add .prettierignore.

Documentation updates:

• Update root README.md and CONTRIBUTING.md; formatting, update referenced Node.js version to v22.x; add details to contribution guidelines.

GitHub Workflows:

• Update workflows to use test:ci.