Add comprehensive Cloudflare Pages endpoint support

[EmilLindfors]

Summary

This issue requests the addition of comprehensive Cloudflare Pages endpoint support to cloudflare-rs. Currently, the library lacks Pages project and deployment management endpoints needed for full Pages operations.

Background

Cloudflare Pages is a JAMstack platform for deploying static sites and full-stack applications. While cloudflare-rs has extensive support for other Cloudflare services, it's missing Pages management functionality.

Missing Functionality

The following Pages API endpoints are currently not implemented:

Project Management

• GET /accounts/{account_id}/pages/projects - List projects
• POST /accounts/{account_id}/pages/projects - Create project
• GET /accounts/{account_id}/pages/projects/{project_name} - Get project details
• PATCH /accounts/{account_id}/pages/projects/{project_name} - Update project
• DELETE /accounts/{account_id}/pages/projects/{project_name} - Delete project

Deployment Management

• GET /accounts/{account_id}/pages/projects/{project_name}/deployments - List deployments
• POST /accounts/{account_id}/pages/projects/{project_name}/deployments - Create deployment
• POST /accounts/{account_id}/pages/projects/{project_name}/deployments/{deployment_id}/retry - Retry deployment
• POST /accounts/{account_id}/pages/projects/{project_name}/deployments/{deployment_id}/rollback - Rollback deployment

Domain Management

• GET /accounts/{account_id}/pages/projects/{project_name}/domains - List custom domains
• POST /accounts/{account_id}/pages/projects/{project_name}/domains - Add custom domain
• DELETE /accounts/{account_id}/pages/projects/{project_name}/domains/{domain_name} - Remove domain

Proposed Solution

Implement a complete pages endpoints module that provides:

• Project Management: Full CRUD operations for Pages projects
• Deployment Operations: Create, retry, rollback, and monitor deployments
• Domain Management: Custom domain configuration and management
• Build Configuration: Environment variables and build settings
• API Specification Compliance: 100% compliance with official OpenAPI spec

Impact

This would enable developers to:

• Manage Pages projects programmatically from Rust applications
• Automate deployment workflows and CI/CD pipelines
• Configure custom domains and build settings
• Build complete static site management tools on Cloudflare's platform

References

• Cloudflare Pages Documentation
• Cloudflare API Documentation
• Pages REST API Reference

I have a complete implementation ready following the same patterns as the D1 module, with full test coverage and spec compliance. Happy to submit a PR if this addition would be welcomed.