Add MVP implementation of auth wrapper using google oauth

[amrit110]

This pull request introduces a comprehensive initial setup for authentication infrastructure, code quality enforcement, and developer tooling. It adds automated workflows for code checks and unit testing, configures Prettier and pre-commit hooks for code style and linting, and provides a Next.js demo app with server-side Google OAuth authentication. The changes establish a strong foundation for package development and secure authentication using a shared OAuth client model.

CI/CD and Code Quality Automation

• Added GitHub Actions workflows for code checks (code_checks.yml) and unit tests (unit_tests.yml), ensuring automated linting, formatting, type-checking, and test coverage on pushes and pull requests. [1] [2]
• Introduced .pre-commit-config.yaml and Prettier configuration (.prettierrc.json, .prettierignore) to enforce consistent code style, linting, type checks, and run tests before commits. [1] [2] [3]

Authentication Demo App (Next.js)

• Added a fully functional Next.js demo app (apps/demo-nextjs) showcasing server-side Google OAuth 2.0 authentication with PKCE, domain restriction, and secure session management using HTTP-only cookies. Includes API routes for login, callback, logout, and session retrieval. [1] [2] [3] [4] [5]
• Provided example environment configuration and documentation for setting up Google OAuth credentials and running the demo. [1] [2]

Monorepo and Package Management

• Configured .npmrc for GitHub Packages registry and peer dependency handling, supporting monorepo development and private package publishing.

Documentation and Developer Experience

• Rewrote the main README.md to explain the shared OAuth client architecture, integration steps, security features, and development workflow.
• Added a Python version file for consistent tooling in CI and development.

Demo App Configuration

• Added Next.js config (next.config.js) for the demo app with strict mode enabled.