Chooser and Admin parts should be refactored as a SPA

[dsuhinin]

Right now Chooser and Admin applications are applications which is processed and rendered on backend side. In near future it could lear to some complexity:

• it is a bit hard to extend them and add new functionality.
• we have mlflow and aim which are SPA and we have chooser and admin which are not. support different types of apps is a bit of pain.
• auth logic could lead to the complexity, when you have to limit some actions on UI(hide/show buttons and UI components) it could be a bit tricky on server side.