The goal of this issue is to remove errai RPC dependency from DashBuilder runtime:

Dependencies on Errai PRC:

1) Data Set lookup

2) Runtime Model fetch

Dependency on events

1) Model changes listener from Dev mode.

This should change:

1) RPC should be replaced by REST endpoints calls from client;

2) Events should use SSE (Server Sent Events) and not throw errors when the server is not in dev mode.

Fix all the issues related to these changes