Render error handling

[mofojed]

When there's an error rendering an element, the error is just printed to the python console out of band and is kind of disruptive. The error should be communicated to the client so that it can display an appropriate toast or error message in the console with more help.

A sample bit of code for a component that throws:

from deephaven import ui

@ui.component
def bad_comp():
    raise Exception("This component throws")

bc = bad_comp()

[bmingles]

As part of this, we should add an ErrorBoundary at the panel level to keep errors isolated to single panels

[alexpeters1208]

Here's another example of code that throws without any feedback:

from deephaven import ui

@ui.component
def button_group_panel(set_val):
    return ui.panel(
        ui.button_group(
            ui.button("Val1", on_press=set_val),
            ui.button("Val2", on_press=set_val)
        )
    )

@ui.component
def display_panel(val):
    return ui.panel(
        ui.text(val)
    )

@ui.component
def my_layout():
    val, set_val = ui.use_state("Val1")

    return ui.row(
        ui.column(
            button_group_panel(set_val)
        ),
        ui.column(
            display_panel(val)
        )
    )

my_dashboard = ui.dashboard(my_layout())