Support for sharing logs to client #158
Description
It's fairly typical in a deployment to want to get the logs of both the client process and the widget. Reporting bugs for end users is hard enough without having to ask them to do it twice, particularly in the context of projects like Element Call where it's deeply embedded in the client to the point where the lines are quite blurred.
With this in mind, it would be good to get a permission where a client may request logs from the widget, and then the widget will begin to stream relevant log lines back to the client so that the client may package up all logs as a potential log dump for developers to debug.
Note, for live debugging a session this isn't required as most major browsers already merge logs between the parent page and iframes so this is specifically about packaging logs up in a file format, as Element Web does.
Current thinking is the client can indicate to the widget that it supports log sharing via a URL parameter, and the widget may either choose to share or not share logs depending on support from the application.
Security wise, I believe it's reasonable to assume the user does trust the client they are using and so sharing logs to it isn't particularly sensitive.