Editor: Register core blocks on the server

Exposes all core blocks (excluding embeds) on the server to be used with the REST API block types endpoint.

Props spacedmonkey, timothyblynjacobs.
Fixes #50263.


Built from https://develop.svn.wordpress.org/trunk@48262


git-svn-id: http://core.svn.wordpress.org/trunk@48031 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/blocks/columns/block.json

@@ -0,0 +1,21 @@
+{
+	"name": "core/columns",
+	"category": "design",
+	"attributes": {
+		"verticalAlignment": {
+			"type": "string"
+		}
+	},
+	"supports": {
+		"align": [
+			"wide",
+			"full"
+		],
+		"html": false,
+		"lightBlockWrapper": true,
+		"__experimentalColor": {
+			"gradients": true,
+			"linkColor": true
+		}
+	}
+}