Add Plot

Here is the `plot_graph()` that is in char of the bars and scatter plot items.

Also all the necessary code  for the graph to be shown.

examples/max_pain.py

@@ -12,8 +12,7 @@ from piker.brokers.deribit.api import (
 )
 import sys
 import pyqtgraph as pg
-from PyQt6 import QtCore
-from pyqtgraph import ScatterPlotItem, InfiniteLine
+from pyqtgraph import ScatterPlotItem
 from PyQt6.QtWidgets import QApplication
 
 def check_if_complete(
@@ -136,21 +135,6 @@ async def max_pain_daemon(
             )
             plot.addItem(scatter_iv)
 
-        total_intrinsic_value, max_pain = get_intrinsic_value_and_max_pain(intrinsic_values)
-
-        vertical_line = InfiniteLine(
-            pos=max_pain,
-            angle=90,
-            pen=pg.mkPen(color='yellow', width=2, style=QtCore.Qt.PenStyle.DotLine),
-            label=f'Max pain: {max_pain:,.0f}',
-            labelOpts={
-                'position': 0.8,
-                'color': 'yellow',
-                'movable': True
-            }
-        )
-        plot.addItem(vertical_line)
-
     def update_oi_by_strikes(msg: tuple):
         nonlocal oi_by_strikes
         if 'oi' == msg[0]: