Add Redshift writer

src/load/redshift_writer.py

@@ -0,0 +1,8 @@
+import pandas as pd
+from sqlalchemy import create_engine, text
+
+
+def write_to_redshift(df: pd.DataFrame, table: str, conn_str: str, if_exists: str = "append") -> int:
+    engine = create_engine(conn_str)
+    rows = df.to_sql(table, engine, if_exists=if_exists, index=False, method="multi", chunksize=1000)
+    return rows or 0