Remove limitation of having a single predictor (application) per codeset

[stefannica]

Deploying two or more prediction services from the same codeset is not currently possible. The following objects and resources have identifiers that are tied to the codeset name and project:

• the FuseML Application
• the specific CRD instances (e.g. seldon core, kfserving)
• the URL where the prediction service is running

[jsuchome]

Implemeted with fuseml/extensions#59