...and rename Blockly.blocks.all (blocks/all.js) to
Blockly.libraryBlocks (blocks/blocks.js
BREAKING CHANGE: (only) because the exports object from the
`blocks_compressed.js` chunk will be accessed as
`Blockly.libraryBlocks` instead of `Blockly.blocks.all` when the
chunk is loaded in a browser via a `<script>` tag. There will
be no changes visible when the chunk is loaded via ES module
`import` or CJS `require`.