[2.1.0] Add config migration from UI Patterns 1.x

Problem/Motivation

Add a drush command to migrate config from UI Patterns 2:

• core.entity_view_display.{entity_type}.{bundle}.{view_mode} with manage display and layout builder
• views.view.{view}

We are not targeting a 100% scope but just some common uses cases. We want to help migration, not do full migration.

Proposed resolution

Documentation https://docs.google.com/document/d/1A4jUkz0ETBQC6hUCmDfRtEziH0C7Db6ncpBx...

Remaining tasks

Let's start by collecting before / after YAML snippets to build unit tests.