fix: expose missing NumberListNode from index export (#2010)

Context: I'm making a library called scrapbox-parser-to-markdown that takes the output of scrapbox-parser and converts it to markdown.
In this library, I need the `NumberListNode` type to type things correctly.
Since other nodes are already exposed from `index.ts`, I think it's more natural to expose `NumberListNode` as well.

See how I use `NumberListNode` in my codebase: https://github.com/0b5vr/scrapbox-parser-to-markdown/blob/bc7f7a9511c68f19aa5fef5e464cc1042912f57f/src/nodeToMarkdown.ts#L77

Workaround: `type NumberListNode = Extract<Node, { type: 'numberList' }>;` would work.

Author: 0b5vr

src/index.ts

@@ -15,6 +15,7 @@ export type {
 	ImageNode,
 	LinkNode,
 	Node,
+	NumberListNode,
 	PlainNode,
 	QuoteNode,
 	StrongIconNode,