docs: add generator for llms-full.txt (#11323)

* initial

* improvements

* finished implementation

* transform links to index.html.md links

* fix for resources

www/packages/docs-utils/src/oas-file-to-path.ts

@@ -0,0 +1,5 @@
+export function oasFileToPath(fileName: string): string {
+  return `/${fileName
+    .replaceAll(/(?<!\{[^}]*)_(?![^{]*\})/g, "/")
+    .replace(/\.[A-Za-z]+$/, "")}`
+}