feat: Use frame.collectJavaScriptCallStack() for renderer ANR in Electron >= v34

[timfish]

• Closes Make use of frame.collectJavaScriptCallStack() for renderer ANR #1060

Previously, renderer process "App Not Responding" events captured stack traces via the Electron debugging API.

Since Electron v34, the frame.collectJavaScriptCallStack() API has been added which lets us capture stack traces via the same code used for Chromium's proposed Crash Reporting API.

This PR:

• Adds an internal function to capture StackFrame[] from a renderer
  • captureRendererStackFrames(webContents: WebContents): Promise<StackFrame[]>
  • We could also export this function so users could use it elsewhere? Users might want to use it with Electrons unresponsive events rather than our own ANR detection?
• Adds an new top-level option enableRendererStackCapture that enables this Chromium feature and injects the required Document-Policy headers
• If this feature is enabled and the Electron version is >= v34, we use the new native API rather than the debugger.

To enable this feature for renderer ANR:

Main process:

import * as Sentry from "@sentry/electron/main";

Sentry.init({
  dsn: "__DSN__",
  enableRendererStackCapture: true
});

Renderer process:

import * as Sentry from "@sentry/electron/renderer";

Sentry.init({
  anrDetection: { captureStackTrace: true },
});

Why a new top-level option?

I would rather have zero configuration for this feature but since it requires headers to be injected before the page loads, I felt that this was the only reasonable option. We already have a top level option to enable js-profiling because this also requires injection of headers.

Should captureStackTrace default to true?

Since this feature no longer uses the debugger, we might want to captureStackTrace: true the default in this case? When would you not want stack traces?

[AbhiPrasad]

Could we re-evaluate the enableRendererStackCapture name? It seems confusing to me, especially because marking it undefined will still cause the integration to work.