Block JSON schema: add renaming key to supports definition

[t-hamano]

Related to #54426

What?

This PR adds renaming key to supports definition in block.json schema.

Why?

To allow developers to design block.json with reference to the correct schema.

Testing Instructions

Create the following JSON file locally, specifying the JSON schema changed by this PR.

{
	"$schema": "https://raw.githubusercontent.com/WordPress/gutenberg/block-json-schema-renaming/schemas/json/block.json",
	"apiVersion": 3,
	"name": "test/test",
	"title": "Test"
}

You should see the renaming key listed in the supports property.

[github-actions]

Flaky tests detected in 725b3fd.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7354374181
📝 Reported issues:

• [Flaky Test] should load styles added through block editor settings #54602 in /test/e2e/specs/editor/plugins/iframed-enqueue-block-editor-settings.spec.js

[getdave]

Thank you!