[DX] [D8] Add a `validate()` method to entity classes

In Drupal 8, classes that are used in order to implement a content entity (which extend the ContentEntityBase class) have a validate() method that validates the values entered when creating the entity.

A similar method should be introduced in Backdrop and added to EntityInterface.

GitHub Link:

https://github.com/backdrop/backdrop-issues/issues/6061

GitHub Issue #:

6061

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