Add IsProduction flag on DeploymentTarget

[aslotte]

Is your feature request related to a problem? Please describe.
Our deployment targets can have random names, based on what the users wants to name them. This is awesome but makes it difficult to e.g. write a method to fetch the evaluation metrics of the model in production.

Describe the solution you'd like
I propose we add a flag on deployment target for IsProduction that can be optionally set (default to false) when creating a deployment target.

[willvelida]

@aslotte all good if I close this issue?

[aslotte]

Please do!