Assertion Error after Drupal 11 fixes [#3606495]

Problem/Motivation

The Drupal 11 compatibility has been merged, but when I tested it I received the following error:

AssertionError:
"Computed" must be defined in MODULE_NAME.field_type_categories.yml inassert() (line 183 of/var/www/html/web/core/lib/Drupal/Core/Field/FieldTypePluginManager.php).

Looking through the comments in the issue and the MR, nothing has been done about comment #15. If we not following the Drupal standards, removing the Category is also viable.

Steps to reproduce

- Updated the module to 3.0.0.
- Update core to 11.3.10.
- Try adding a new field.

Issue fork computed_field-3606495

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3606495-assertion-error-after changes, plain diff MR !29
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