Allow to specify all flow metadata with TF resource instead of YAML

[aballiet]

Feature description

Attributes that are implemented as metadata of any flow like disabled, namespace , labels should be directly available at the Terraform resource level instead of YAML, might even be good to have for inputs and variables.

• When using Terraform it means you likely want to modularize and control config of each flow / module (modifié).
• When creating TF module currently, you then need to template all these metadata in YAML (disabled, description, labels) where it should be native.
• Putting everything in the YAML limits any logic proper to terraform where you can reuse inputs as outputs easily...
• Currently the logic is kind of mixed : metadata (namespace, id) in resource and the rest in YAML.