Modernize python-minecraft-data with Poetry, Pooch, and CI infrastructure
                                                                                    
  Summary                                                   
                                                                                    
  Transform python-minecraft-data from legacy setuptools packaging to modern Python 
  best practices with Poetry, lazy data loading via Pooch, comprehensive testing,
  and GitHub Actions CI.                                                            
                                                            
  Changes

  Packaging & Dependencies
  - Replace setup.py with pyproject.toml (Poetry)
  - Add pooch ^1.9.0 for lazy, cached data loading
  - Organize dependencies into dev group          
  - Update to newexo repository                                                     
                                                                                    
  Data Loading                                                                      
  - Implement minecraft_data/data.py with Pooch-based lazy loading                  
  - Download minecraft-data master branch on-demand, cached to    
  ~/.cache/minecraft_data                                                           
  - Support MINECRAFT_DATA_DIR environment variable for custom cache locations      
  - Refactor __init__.py to use lazy loading with fallback to bundled data    
                                                                                    
  Testing & Quality                                         
  - Add 39 comprehensive tests across 4 test modules (92.22% coverage, exceeds 90%  
  threshold)                                                                        
    - test_module_structure.py — Module interface and custom class                  
    - test_data_loading.py — Pooch lazy loading and data validation                 
    - test_integration.py — Full module integration workflows                       
    - test_tools.py — Data conversion functionality          
  - Create Makefile with standard targets: test, format, lint, check, coverage      
  - Simplify linting configuration (remove unnecessary exceptions)            
                                                                                    
  CI/CD                                                                             
  - Add .github/workflows/python-package.yml testing on Python 3.11–3.13            
  - Cache minecraft-data downloads for faster CI runs                               
  - Enforce 90% test coverage requirement                   
                                                                                    
  Project Hygiene                                           
  - Replace .rst README with modern Markdown                                        
  - Remove git submodule (now handled by Pooch)             
  - Expand .gitignore with standard Python development artifacts                    
  - Remove legacy setup.py

Trigger on merging to master

Pin to a known version of minecraft data

Correctly support 1.20.5 and document 1.20.6 as a stubbed version