feat(external): supporting chart info database

src/arcaea_offline/external/chart_info_db/__init__.py

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+from .parser import ChartInfoDbParser

src/arcaea_offline/external/chart_info_db/parser.py

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+import contextlib
+import sqlite3
+from typing import List
+
+from sqlalchemy.orm import Session
+
+from ...models.songs import ChartInfo
+
+
+class ChartInfoDbParser:
+    def __init__(self, filepath):
+        self.filepath = filepath
+
+    def parse(self) -> List[ChartInfo]:
+        results = []
+        with sqlite3.connect(self.filepath) as conn:
+            with contextlib.closing(conn.cursor()) as cursor:
+                db_results = cursor.execute(
+                    "SELECT song_id, rating_class, constant, notes FROM charts_info"
+                ).fetchall()
+                for result in db_results:
+                    chart = ChartInfo(
+                        song_id=result[0],
+                        rating_class=result[1],
+                        constant=result[2],
+                        notes=result[3] or None,
+                    )
+                    results.append(chart)
+
+        return results
+
+    def write_database(self, session: Session):
+        results = self.parse()
+        for result in results:
+            session.merge(result)