Blocks: Introduce register_block_type(), unregister_block_type(), and get_dynamic_blocks() functions.

These helper functions allow easy access to the global block registry.

Merges [43743] from the 5.0 branch to trunk.

See #45109.


git-svn-id: https://develop.svn.wordpress.org/trunk@44109 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/data/blocks/do-blocks-expected.html

@@ -0,0 +1,17 @@
+<p>First Auto Paragraph</p>
+
+<!--more-->
+
+<p>First Gutenberg Paragraph</p>
+
+<p>Second Auto Paragraph</p>
+
+
+<p>Third Gutenberg Paragraph</p>
+
+<p>Third Auto Paragraph</p>
+
+<p>[someshortcode]</p>
+<p>And some content?!</p>
+<p>[/someshortcode]</p>
+

tests/phpunit/data/blocks/do-blocks-original.html

@@ -0,0 +1,25 @@
+<p>First Auto Paragraph</p>
+
+<!--more-->
+
+<!-- wp:core/paragraph -->
+<p>First Gutenberg Paragraph</p>
+<!-- /wp:core/paragraph -->
+
+<p>Second Auto Paragraph</p>
+
+<!-- wp:core/test-self-closing /-->
+
+<!-- wp:core/paragraph -->
+<p>Third Gutenberg Paragraph</p>
+<!-- /wp:core/paragraph -->
+
+<p>Third Auto Paragraph</p>
+
+<!-- wp:core/shortcode -->
+[someshortcode]
+
+And some content?!
+
+[/someshortcode]
+<!-- /wp:core/shortcode -->