(feat) add visualizations for backtesting

frontend/visualization/candles.py

@@ -0,0 +1,12 @@
+import plotly.graph_objects as go
+import pandas as pd
+
+def get_candlestick_trace(df):
+    df.index = pd.to_datetime(df.timestamp, unit='ms')
+    return go.Candlestick(x=df.index,
+                          open=df['open'],
+                          high=df['high'],
+                          low=df['low'],
+                          close=df['close'],
+                          name="Candlesticks",
+                          increasing_line_color='#2ECC71', decreasing_line_color='#E74C3C')