Allow server to provide aggregate relations

[codeliner]

With the PR the server can provide aggregate relations that are merged with the user defined aggregateConfig. This feature is particularly useful for the integration with InspectIO and the code generator. Developers can define relations already in InspectIO and the info is forwarded by the backend to Cockpit.

[martin-schilling]

Nice Feature 😃 We‘ll need to think about documentation later since there are three ways (config file, server and hooks) to configure this now which is a little complicated

[codeliner]

@martin-schilling yeah, that's true!

InspectIO integration was the more important factor for me here. Goal is to let InspectIO and Cockpit play really nice together with zero configuration for the user. But both tools should still work standalone, hence we need the other options, too.

By the way, I have working Node.JS TypeScript backend connected to Cockpit, with 90% of the code generated from an InspectIO event map ;) Can't wait to show you this baby in October.

[martin-schilling]

By the way, I have working Node.JS TypeScript backend connected to Cockpit, with 90% of the code generated from an InspectIO event map ;) Can't wait to show you this baby in October.

Sounds great! Can‘t wait to check it out