Add support for ignoring vendor files in source maps

[mukilane]

Chrome Devtools has had a feature to ignore frames from vendor/third-party files in stack trace and callstack during debugging.

It can be enabled by manually adding the files to exclude in Settings > Ignore List
or by setting x_google_ignoreList extension in the sourcemap which Devtools will parse and ignore.

I am hoping Ember can add support for the source map extension.

	Call Stack	Stacktrace
With Ignore List
Without Ignore List

(I had excluded backburner, runtime, @ember/-interal/*, and @ember/runloop)

References

1. https://developer.chrome.com/articles/x-google-ignore-list/
2. https://developer.chrome.com/docs/devtools/settings/ignore-list/