Re-introduce CR status

[LionelJouin]

Is your feature request related to a problem? Please describe.
When a stream is deployed but the conduit it is refering to is not existing, the stream is not really active. To see this, the user would have to manually check the conduits and see if it is existing or not. The same thing apply for other resources like flows.

Describe the solution you'd like

Introduce the status for the custom resources with the following possible status:

Name	Description
NoPhase	Default, will be showing if the operator is not existing or if the resource has not yet been processed
Error	?
Disengaged	The reference to the parent resource does not exist
Engaged	The resource is deployed and ready to be used

The constants for the status are still existing but not used: https://github.com/Nordix/Meridio/blob/master/api/v1/types.go#L29

Describe alternatives you've considered
/

Additional context

This feature has already been developed and introduced with this PR: Nordix/Meridio-Operator#16 and it has been removed (not sure the reason) in this PR: Nordix/Meridio-Operator#34