refactor(blocks)!: Rename Blockly.blocks.* modules to Blockly.libraryBlocks.* (#5953)

...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`.

blocks/blocks.js

@@ -0,0 +1,47 @@
+/**
+ * @license
+ * Copyright 2021 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview All the blocks.  (Entry point for blocks_compressed.js.)
+ * @suppress {extraRequire}
+ */
+'use strict';
+
+goog.module('Blockly.libraryBlocks');
+goog.module.declareLegacyNamespace();
+
+const colour = goog.require('Blockly.libraryBlocks.colour');
+const lists = goog.require('Blockly.libraryBlocks.lists');
+const logic = goog.require('Blockly.libraryBlocks.logic');
+const loops = goog.require('Blockly.libraryBlocks.loops');
+const math = goog.require('Blockly.libraryBlocks.math');
+const procedures = goog.require('Blockly.libraryBlocks.procedures');
+const texts = goog.require('Blockly.libraryBlocks.texts');
+const variables = goog.require('Blockly.libraryBlocks.variables');
+const variablesDynamic = goog.require('Blockly.libraryBlocks.variablesDynamic');
+/* eslint-disable-next-line no-unused-vars */
+const {BlockDefinition} = goog.requireType('Blockly.blocks');
+
+
+exports.colour = colour;
+exports.lists = lists;
+exports.logic = logic;
+exports.loops = loops;
+exports.math = math;
+exports.procedures = procedures;
+exports.texts = texts;
+exports.variables = variables;
+exports.variablesDynamic = variablesDynamic;
+
+/**
+ * A dictionary of the block definitions provided by all the
+ * Blockly.libraryBlocks.* modules.
+ * @type {!Object<string, !BlockDefinition>}
+ */
+const blocks = Object.assign(
+    {}, colour.blocks, lists.blocks, logic.blocks, loops.blocks, math.blocks,
+    procedures.blocks, variables.blocks, variablesDynamic.blocks);
+exports.blocks = blocks;