Related changes in Gutenberg: https://github.com/WordPress/gutenberg/pull/35038.
When adding a block with a view.js script, the frontend loads an additional ~20kb of scripts that were previously not there. These are coming from polyfills that are defined as a dependency for view.js scripts.
Since WordPress dropped support for IE, these polyfills are no longer needed and can be removed.
Follow-up to [51501].
See #53690.
Props aristath.
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It aligns with the changes proposed added in Gutenberg: https://github.com/WordPress/gutenberg/pull/33293.
The idea here is to split the growing webpack config into two parts: blocks and packages.
We need to add handling for JavaScript files that are going to be used with blocks on the frontend. They didn't work quite well with the current setup for entry points created for packages.
As part of the effort, it adds support for `viewScript` in `block.json` metadata file that is later translated to `$view_script` in `WP_Block_Type` class and exposed as `view_script` from the REST API endpoint for block types.
Props youknowriad, desrosj, aristath.
Fixes#53690.
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