Hook electron's `crashReporter` up to debug logs submitter

[dbkr]

We currently have zero visibility on renderer process crashes, but electron has a thing to catch them: https://www.electronjs.org/docs/api/crash-reporter

Ideally we would present a popup at next launch, prompting the user to submit a crash report which it would do in the same way as submitting debug logs (possibly modifying the rageshake server to accept whatever info the crash reporter spits out).

https://github.com/vector-im/element-desktop/issues/824 is an example of what is probably the renderer process crashing: the only visibility we have is people filing github issues and there's not really any way to get debug info out of them.

[dbkr]

Although actually it looks like the API doesn't even let you get at the crash reports until after they've been uploaded, so would need some acrobats to be made privacy-friendly.