fix(node): ANR fixes and additions

[timfish]

This PR makes a few fixes and additions to the ANR feature.

• Stops passing the sdk property with the event since enhanceEventWithSdkInfo results in duplicate integrations/packages being sent!
• Allows the passings of staticTags to attach to ANR events
  • Required by Electron SDK to tag the source process/origin/environment
  • Could also be useful for other users
• Optionally enable normalising of stack frame paths to the app root
  • Required for Electron
  • Soon required for Node with Node stack filenames should be relative to app root #9072

The path normalisation code (and tests) are from the Electron SDK and is well tested on all platforms. However, it will only be called when appRootPath is supplied. If/when we add path normalisation to Node, it will have a default which can be overridden.

The Electron SDK will then wrap the Node Anr integration something like this:

class Anr extends NodeAnr {
  public constructor(options: Partial<Options> = {}) {
    super({
      ...options,
      staticTags: {
        'event.environment': 'javascript',
        'event.origin': 'electron',
        'event.process': 'browser',
        ...options.tags,        
      },
      appRootPath: app.getAppPath(),
    });
  }
}