We decided to rework the kobs architecture, by splitting it into two
components. A "satellite" which can run in each Kubernetes cluster which
should be manageable via kobs and a "hub" which provides access to the
"satellites" and which serves the UI.

This should allow us to run a single kobs instance in the future, where
we do not have to expose the services behind plugins to the public.

Implement store as part of the hub

* Add watcher implementation

* Connect watcher with store

* Add bolt db as store option

* Rework CRDs

* Adjust store interface

* Add satellite to resources when it is not set

* Add mode flag for hub

* Adjust auth tests

* Improve satellites router

* Add secure options field for plugins

* Use interface for all servers

* Add sync for namespaces

* Improve frontend handling

* Use yarn workspaces and lerna for frontend

* Add Istio plugin

* Fix linter warnings

…quests

…Kubernetes resources

Rework kobs architecture, by introducing a "hub" and "satellite"
component. This new architecture allows us to run the kobs "hub"
component in a central cluster and access clusters / services (plugins)
through the kobs "satellite" component.

The following tasks are still todo:

- We have to update the documentation with the new architecture.
- We have to update the plugin documentation.
- We have to adjust the demo.