feat: Add payload layouts to dashboard (#425)

* fix: Rename SPA to dashboard and disable portcheck of peer_replica

* feat: Add data & unknown type of payload to dashboard

* refactor: Implement paylaod interface that allows different json structs

* feat: Implement Drng paylaod

* refactor: Use Listgroup for layout consistency

* doc: Add description

* feat: Implement Value payload handler

* feat: Add Value payload layout

* refactor: Refactor payload layouts

* refactor: Remove debug print out

* fix: Remove redundant assignment

* refactor: Fix 

* refactor: Fix