build: monorepo

[jpoehnelt]

blocker for #76

[Copilot]

Pull Request Overview

This PR restructures the repository into a monorepo using Turborepo and pnpm workspaces, replacing the previous wireit-based build system. The changes introduce centralized package management through pnpm catalogs and implement changesets for release management.

Key changes:

• Migrated from wireit to Turborepo for build orchestration
• Moved package source to packages/drive-picker-element/ directory
• Replaced release-please with changesets for version management

Reviewed Changes

Copilot reviewed 13 out of 38 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
turbo.json	Defines Turborepo task pipeline for build, test, lint, format, and check tasks
pnpm-workspace.yaml	Configures monorepo workspace with packages directory and shared dependency catalog
packages/drive-picker-element/package.json	Relocated package configuration with catalog-based dependency references
packages/drive-picker-element/custom-elements.json	Moved generated custom elements manifest to package directory
package.json	Transformed to monorepo root configuration with Turborepo scripts and simplified lint-staged setup
biome.json	Updated configuration with schema reference and JavaScript formatter settings
CONTRIBUTING.md	Added changesets documentation for contributors
.prettierignore	New ignore patterns delegating JS/TS formatting to Biome
.npmrc	Enabled pre/post scripts for package lifecycle hooks
.github/workflows/test.yml	Updated to use specific action versions and removed bundlewatch step
.github/workflows/release.yml	Switched from release-please to changesets-based release workflow
.github/workflows/lint.yml	Updated GitHub Actions to pinned commit versions
.github/workflows/docs.yml	Updated GitHub Actions to pinned commit versions and removed trailing whitespace

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