feat(calculator): support generate PerformanceAttributes & DifficultyAttributes from JSON Schema (#59)

Prepare for custom rulesets.

Schema Genetator: https://github.com/GooGuTeam/custom-rulesets/tree/main/CustomRulesetMetadataGenerator

```bash
dotnet -- schemas path/to/rulesets -o schema.json
```

```bash
python scripts/generate_ruleset_attributes.py schema.json 
```

scripts/generate_ruleset_attributes.py

@@ -0,0 +1,64 @@
+import datetime
+from pathlib import Path
+import re
+import subprocess
+import sys
+
+from datamodel_code_generator import DataModelType, generate
+from datamodel_code_generator.format import Formatter
+
+OUTPUT_FILE = Path("app/models/performance.py")
+
+
+def generate_model(schema_file: Path, version: str = ""):
+    temp_file = OUTPUT_FILE.parent / "_temp.py"
+    if temp_file.exists():
+        temp_file.unlink()
+    temp_file.touch()
+
+    version = version or datetime.datetime.now().strftime("%Y.%m.%d")
+
+    generate(
+        input_=schema_file,
+        output=temp_file,
+        output_model_type=DataModelType.PydanticV2BaseModel,
+        disable_future_imports=True,
+        formatters=[Formatter.RUFF_CHECK, Formatter.RUFF_FORMAT],
+        custom_file_header=(
+            f"# Version: {version}\n"
+            "# Auto-generated by scripts/generate_ruleset_attributes.py.\n"
+            "# Schema generated by https://github.com/GooGuTeam/custom-rulesets\n"
+            "# Do not edit this file directly.\n"
+            "# ruff: noqa: E501\n"
+        ),
+    )
+
+    code = temp_file.read_text()
+    output = code
+    performance_attributes_classes = re.findall(r"class (\w+PerformanceAttributes)", code)
+    performance_attributes_classes.append("PerformanceAttributes")
+    output += "PerformanceAttributesUnion = " + " | ".join(performance_attributes_classes) + "\n"
+    difficulty_attributes_classes = re.findall(r"class (\w+DifficultyAttributes)", code)
+    difficulty_attributes_classes.append("DifficultyAttributes")
+    output += "DifficultyAttributesUnion = " + " | ".join(difficulty_attributes_classes) + "\n"
+    OUTPUT_FILE.write_text(output)
+    temp_file.unlink(missing_ok=True)
+
+    subprocess.run(
+        ["uv", "run", "ruff", "check", "--fix", "app/models/performance.py"],  # nosec B607  # noqa: S607
+        capture_output=True,
+    )
+    subprocess.run(
+        ["uv", "run", "ruff", "format", "app/models/performance.py"],  # nosec B607  # noqa: S607
+        capture_output=True,
+    )
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 1:
+        print("Usage: python scripts/generate_ruleset_attributes.py <schema_file> [version]")
+        sys.exit(1)
+    if len(sys.argv) > 2:
+        generate_model(Path(sys.argv[1]), sys.argv[2])
+    else:
+        generate_model(Path(sys.argv[1]))