Summary:

Implementation of the whole suite of skupper site commands in order to facilitate site management functions.

Requirements/Upstream documentation:

https://skupperproject.github.io/refdog/commands/site.html

Acceptance criteria:

• skupper site update command
• skupper site delete command
• skupper site status command
• export custom resources for site creation/update in declarative format (yaml/json)

Testing:

• Given that each command will implement the SkupperCommand interface, it is required  to create unit test for each implementation.
• Test if the generated declarative files work as expected with kubernetes.