Add progress tracking for backtesting

freqtrade/enums/backteststate.py

@@ -0,0 +1,14 @@
+from enum import Enum
+
+
+class BacktestState(Enum):
+    """
+    Bot application states
+    """
+    STARTUP = 1
+    DATALOAD = 2
+    ANALYZE = 3
+    BACKTEST = 4
+
+    def __str__(self):
+        return f"{self.name.lower()}"