Backstage: [Plugin] Backstage Config Explorer

[Rugvip]

Summary

A plugin for exploring the configuration of a Backstage instance. Listing all installed plugins and their versions, and any other config that is available. For example URLs and registered entity types, etc.

Could also be a place to show which plugins have new versions or recommended replacements.

Context

Should be a useful tool for maintainers to get an overview of an installation, and help out with troubleshooting.

[stefanalund]

This open up a whole category of potential tools and dashboards under an /admin umbrella 😄

[dtuite]

Might want to move to a config based plugin install for this effort. Adding or removing plugins currently requires code changes in plugins.ts and potentially (?) app/src/apis.ts which I presume means a commit, build and redeployment.

[Rugvip]

@dtuite we'd have access to that at runtime though. But we do want to move things to static config for that any many other reasons :grin:

[stefanalund]

Related discussion https://github.com/spotify/backstage/issues/138.