Add data source identifier to exception messages

Author: MDUYN

examples/tutorial/backtests/MACDDivergenceEMACrossFilterStrategy/014aadef/metadata.json

@@ -0,0 +1,17 @@
+{
+    "params": {
+        "close_timeframe": "4h",
+        "macd_timeframe": "2h",
+        "macd_short_period": 12,
+        "macd_long_period": 26,
+        "macd_signal_period": 9,
+        "ema_timeframe": "1D",
+        "ema_short_period": 25,
+        "ema_long_period": 200,
+        "ema_cross_lookback_window": 168,
+        "number_of_neighbors_to_compare": 3,
+        "min_consecutive": 2,
+        "divergence_lookback_window_size": 12
+    },
+    "id": "014aadef"
+}

examples/tutorial/backtests/MACDDivergenceEMACrossFilterStrategy/014aadef/risk_free_rate.json

@@ -0,0 +1,3 @@
+{
+    "risk_free_rate": 0.027
+}