Set block attributes to require either type or enum

[griffinjohndavid]

What?

Updates the block.json schema to make type or enum be the required options for attributes.

Why?

The schema used for block.json currently shows an issue for block attributes that use an enum rather than type. According to the developer handbook, this works as an either or rather than just type.

How?

Changes "required": [ "type" ] into a anyOf array to require either type or enum or both

Testing Instructions

1. Update the schema source in block.json to point to the schema file in this branch
2. Ensure that the block attributes don't show an issue when attributes have a defined type OR enum OR both

Screenshots

Current Schema: error for attribute with only enum

image_caption
Current Schema: no error for either option

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[github-actions]

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[gziolo]

Good catch. This is how the documentation covers it:

As of today, we always provide type for core blocks to satisfy the schema validator. However, it doesn't need to be the case.

[github-actions]

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