Capture console.error in dApp with Sentry (#875)

The dApp sometime catches errors and logs them to console without
bubbling it up. This makes Sentry miss some errors. This PR captures
console.error and sends it to Sentry using the `CaptureConsole` plugin:
https://docs.sentry.io/platforms/javascript/configuration/integrations/captureconsole/

dapp/src/sentry/index.ts

@@ -3,7 +3,13 @@ import * as Sentry from "@sentry/react"
 const initialize = (dsn: string) => {
   Sentry.init({
     dsn,
-    integrations: [Sentry.browserTracingIntegration()],
+    integrations: [
+      Sentry.browserTracingIntegration(),
+      Sentry.captureConsoleIntegration({ levels: ["error"] }),
+    ],
+    // Attach stacktrace to errors logged by `console.error`. This is useful for
+    // the `captureConsoleIntegration` integration.
+    attachStacktrace: true,
     // Performance Monitoring
     tracesSampleRate: 0.1,
   })