fix: Matplotlib input table and execution context not working

[jnumainville]

KeyedArrayBackedMutableTable was renamed, which was causing this to break. Moved to the python api and also fixed some issues with the execution context

from deephaven.plugin.matplotlib import TableAnimation
from deephaven import pandas as dhpd
from deephaven import time_table

import matplotlib.pyplot as plt
import seaborn as sns  
import pandas as pd

# Create a ticking table with the cosine function
tt = time_table("PT1S").update(["X = 0.2 * i", "Y = Math.cos(X)"])

fig, ax = plt.subplots() # Create a new figure

# This function updates a figure
def update_fig(data, update):
    # Clear the axes (don't draw over old lines)
    ax.clear()
    # Convert the X and Y columns in `tt` to a DataFrame
    df = dhpd.to_pandas(tt.view(["X", "Y"]))
    # Draw the line plot
    sns.lineplot(df, x="X", y="Y")

# Create our animation. It will listen for updates on `tt` and call `update_fig` whenever there is an update
line_plot_ani = TableAnimation(fig, tt, update_fig)