proxyAuth addon API keys

[russellmcc]

I've been using the proxyAuth add on to great success to put an auth wall on some custom apps, thank you for this amazing feature.

Some of these apps have API paths that I would like to allow third-party apps to use - I could use the existing basic auth for this but I need a different account per-app. It would be more convenient if there was a way to generate API keys for a proxyAuth app that would could be passed as bearer headers to get through the proxyAuth.