feat(Data): resample exogenous/other datasource when their frequency is different (#234)

* feat(Data): resample exogenous/other datasource when their frequency is different

* fix(Linter): ran

* fix(Data): resampling done properly

data_loader/types.py

@@ -1,8 +1,18 @@
+from dataclasses import dataclass
+from typing import Literal
 import pandas as pd
 
 Path = str
 FileName = str
-DataSource = tuple[Path, FileName]
+
+
+@dataclass
+class DataSource:
+    path: Path
+    file_name: FileName
+    freq: Literal["5m", "1h", "1d"]
+
+
 DataCollection = list[DataSource]
 
 ReturnSeries = pd.Series