feat(browser): Add console logging integration

[AbhiPrasad]

ref #15526

Adds consoleLoggingIntegration integration that takes calls to console.X and flushes them as logs. See below about why this is a new integration.

I made this a separate integration because calls we needed to access the capturing methods through the browser SDK, which causes the SDK to start it's flushing mechanisms.

import * as Sentry from '@sentry/browser';

Sentry.init({
  integrations: [Sentry.consoleLoggingIntegration({ levels: ['error', 'warn'] })],
});

Notes

In general we have inconsistencies with console instrumentation across our different SDKs. #4532.

• In browser we have console instrumentation as part of the Breadcrumbs integration.
• In node we have console instrumentation that generates breadcrumbs in the Console integration
• In core we have console instrumentation, which generates errors and messages via the CaptureConsole integration

This makes it hard for me to tell where to add the logging instrumentation for consoles. I found the easiest way around this was to add brand new logging integrations, separate from breadcrumbs and errors functionality.

After this PR gets merged in, I'll take a look at doing the same for Node.js.

[AbhiPrasad]

Closing this, we settled on another approach for this.