fix: adds isAccordion attribute to FAQ block

Adds the `isAccordion` attribute to the FAQ block's schema.

This attribute controls whether the FAQ items are displayed in an accordion style, allowing users to expand and collapse individual questions.
The default value is set to `true`.

Author: firestar300

src/faq/block.json

@@ -10,6 +10,12 @@
 		"html": false,
 		"innerBlocks": true
 	},
+	"attributes": {
+		"isAccordion": {
+			"type": "boolean",
+			"default": true
+		}
+	},
 	"textdomain": "blockparty-faq",
 	"editorScript": "file:./index.js",
 	"viewScript": "file:./script.js",