Add dependency download and CLI functionality

- Implement dependency download and extraction for Zig packages
- Create new CLI commands for downloading and converting ZON files
- Add support for downloading dependencies from ZON files
- Update project dependencies to include httpx and tqdm
- Add WTFPL license file
- Enhance README with more detailed usage instructions and project motivation

tests/test_parser.py

@@ -4,7 +4,6 @@ Unit tests for the ZON parser.
 
 import json
 import pytest
-from pathlib import Path
 
 from zig_fetch_py.parser import ZonParser, parse_zon_file, zon_to_json