Releasing Effection Inspector plugin for Backstage

[taras]

In effort to bring visibility into Backstage server process, we need to be able to see the Effection Inspector in Backstage. We can do this by creating a Backstage plugin that will provide render component in @effection/inspector-ui package.

[taras]

There is work happening in Effection repo around this https://github.com/thefrontside/effection/pull/638#pullrequestreview-961004094

[cowboyd]

Following the recommended plugin structure There are two plugins to make this happen, the inspector-backend plugin which streams effection events as they happen inside the backstage server, and then the inspector plugin which provides the frontend.