Follow-up #54337, [52069]. Part of https://github.com/WordPress/gutenberg/issues/41236. More details in https://github.com/WordPress/gutenberg/issues/33542.
Allow passing more than one script per block for `editorScript`, `script`, and `viewScript` fields in the `block.json` metadata file. This aligns with the previously added changes for `style` and `editorStyle` fields.
This change impacts the `WP_Block_Type` class and the REST API endpoint for block types. To ensure backward compatibiliy old names were soft deprecated in favor of new fields that work with array values and have `_handles` suffix.
Props zieladam, dlh, timothyblynjacobs, aristath, bernhard-reiter.
Fixes#56408.
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