feat: Implement View Helper pattern (#3278)

* #1263 - creating new module for view-helper

* #1263 - creating Product and ProductViewModel

* #1263 - creating interfaces for View and ViewHelper

* #1263 - creating ProductViewHelper and its test

* #1263 - creating Console View for Product

* #1263 - creating ProductController

* #1263 - creating main App and its test

* #1263 - adding license header

* #1263 - keeping module in alphabetical order

* #1263 - creating README and diagrams

* #1263 apply spotless

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Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>