fix: Convert camelCase to snake_case for Python naming conventions (#146)

- Renamed PermissionRuleValue fields: toolName → tool_name, ruleContent
→ rule_content
- Renamed PermissionResultAllow fields: updatedInput → updated_input,
updatedPermissions → updated_permissions
- Removed unused PermissionResult import from query.py
- Fixed trailing whitespace issues in types.py
- Updated all usages in examples and tests to use snake_case

These changes ensure compliance with Python's PEP 8 naming conventions
and fix linting errors.

🤖 Generated with [Claude Code](https://claude.ai/code)

---------

Co-authored-by: Claude <noreply@anthropic.com>

examples/tool_permission_callback.py

@@ -61,7 +61,7 @@ async def my_permission_callback(
             modified_input = input_data.copy()
             modified_input["file_path"] = safe_path
             return PermissionResultAllow(
-                updatedInput=modified_input
+                updated_input=modified_input
             )
 
     # Check dangerous bash commands