make server/client modularity

[darkskygit]

In different environments, we need different server components. For example, in self-hosted environments, we don't need a payment component but do need a sync component, but in the server environment, we only need the sync component in the synchronization server. Currently, we distinguish loading by server flavor.
A better strategy is to make our server components configurable for loading and be able to tell the front-end what components are enabled on the server. The front end also needs to enable/disable corresponding components based on the configuration of the server to avoid errors caused by requesting unloaded components from the server.
A typical real-world example is Gitlab and Bitwarden; for instance, Bitwarden allows different servers to load different components: