feat: Surface python error in Problems tab and Editor

[bmingles]

Python server errors are now surfaced via the Problems tab and red squiggles in the editor.

Testing

• Introduce a typo in a script (e.g. printx('some text'))
• Run the whole file
• Should see an error in the Problems tab + red squiggles on the offending line
• Save. Errors should disappear
• Select the line and "Run Deephaven Selected Lines"
• Error should show again on correct line + Problems tab
• Save. Errors should disappear

UPDATE: found out the running script isn't always the top-level error, so added handling for that. Example to test:

import sys; print(sys.version)

from deephaven import empty_table, time_table
from deephaven.plot import Figure

t1 = empty_table(10).update(["X = i", "Y = 10 * i"])
t2 = time_table("PT1s").update(["X = i%10", "Y = 10 * i"])

t3 = t1.natural_join(t2.last_by("X"), on="X", joins="YY=Y")

p1 = Figure().plot_xy("Plot 1", t1, x="X", y="Y").show()
p2 = Figure().plot_xy(t2, "X", "Y").show()

# p1 = Figure().plot_xy("Plot 1", t1, x="X", y="Y").show()
# p2 = Figure().plot_xy("Plot 2", t2, x="X", y="Y").show()


print("DH Rules")
print("DH Sucks")

resolves #39

[mofojed]

Nice!