feat(ui): Add error boundary to prevent UI crashing due to rendering …

…errors (#245)

This should prevent the whole UI from going blank if there's a rendering
error in JS. An example dashboard that would crash the whole UI
previously is provided below. Now you get an error message and can still
go back to your code studio.

```py
from deephaven import ui

@ui.component
def Foo():
    return [
        ui.row(ui.stack(ui.panel(ui.text('Foo')))),
        ui.row(ui.stack(ui.panel(ui.text('Bar'))))
    ]
f = ui.dashboard(Foo())
```

plugins/ui/src/js/src/DashboardPlugin.tsx

@@ -13,6 +13,7 @@ import { useConnection } from '@deephaven/jsapi-components';
 import { DeferredApiBootstrap } from '@deephaven/jsapi-bootstrap';
 import { Widget } from '@deephaven/jsapi-types';
 import type { VariableDefinition } from '@deephaven/jsapi-types';
+import { ErrorBoundary } from '@deephaven/components';
 import styles from './styles.scss?inline';
 import { WidgetWrapper } from './WidgetTypes';
 import PortalPanel from './PortalPanel';
@@ -204,9 +205,11 @@ export function DashboardPlugin({
   const widgetHandlers = useMemo(
     () =>
       [...widgetMap.entries()].map(([widgetId, widget]) => (
-        <DeferredApiBootstrap key={widgetId} options={widget.metadata}>
-          <WidgetHandler widget={widget} onClose={handleWidgetClose} />
-        </DeferredApiBootstrap>
+        <ErrorBoundary key={widgetId}>
+          <DeferredApiBootstrap options={widget.metadata}>
+            <WidgetHandler widget={widget} onClose={handleWidgetClose} />
+          </DeferredApiBootstrap>
+        </ErrorBoundary>
       )),
     [handleWidgetClose, widgetMap]
   );