Experimental Feature: Add more "widths" to blocks

Problem/Motivation

When using the module_name.gutenberg.yml file, There's an option to define the width layout of the block.

```yaml
# layout must be defined when using align wide setting on version 3.0 or above.
layout:
  contentSize: 670px
  wideSize: 1200px
  ultraWideSize: 1440px
```

The width values are not being applied to the block. And new ones are not listed in the block editor.

Related to: https://www.drupal.org/project/gutenberg/issues/3521709 🐛 Can't do full width alignment - alignWide is ignored Active

Steps to reproduce

1. Install the gutenberg module.
2. Create a module_name.gutenberg.yml file in your theme base folder.
3. Enable the experimental features on the module_name.gutenberg.yml file.
4. Define the layout values on the module_name.gutenberg.yml file.
5. Clear caches.
6. Create a block, and try to use the alignment settings.
7. The alignment settings are not listed nor working properly.

Proposed resolution

When a new layout is defined on the module_name.gutenberg.yml file, the layout options should be visible on the block.

Remaining tasks

User interface changes

API changes

Data model changes