UI: List models page

Implement /-/ml/models/. In this page users are trying to:

• List models in the project (@eduardobonet)
• Search and order models in the project (@eduardobonet)
• Navigate to the latest version of the model
• Navigate to a page that gives details on the model (/-/ml/models/)
• Number of versions in the model (@eduardobonet)

Technical details

• Backend Controller: Ml::ModelsController#index