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.



git-svn-id: https://develop.svn.wordpress.org/trunk@48262 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks/pullquote/block.json

@@ -0,0 +1,38 @@
+{
+	"name": "core/pullquote",
+	"category": "text",
+	"attributes": {
+		"value": {
+			"type": "string",
+			"source": "html",
+			"selector": "blockquote",
+			"multiline": "p"
+		},
+		"citation": {
+			"type": "string",
+			"source": "html",
+			"selector": "cite",
+			"default": ""
+		},
+		"mainColor": {
+			"type": "string"
+		},
+		"customMainColor": {
+			"type": "string"
+		},
+		"textColor": {
+			"type": "string"
+		},
+		"customTextColor": {
+			"type": "string"
+		}
+	},
+	"supports": {
+		"align": [
+			"left",
+			"right",
+			"wide",
+			"full"
+		]
+	}
+}