GH-107347
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Validate extension JSON: Error: Field 'classes/RichTextLabel/methods/add_image/arguments': size changed value in new API, from 6 to 12.
Validate extension JSON: Error: Field 'classes/RichTextLabel/methods/add_image/arguments': size changed value in new API, from 10 to 12.
Validate extension JSON: Error: Field 'classes/RichTextLabel/methods/update_image/arguments': size changed value in new API, from 11 to 12.

Optional argument added. Compatibility methods registered.
