feat: add fetch api

docs/plugin-usage.md

@@ -63,3 +63,11 @@ penpot.on('pagechange', event);
 
 penpot.off('pagechange', event);
 ```
+
+### Requests
+
+Same as the browser fetch API.
+
+```ts
+penpot.fetch('http://example.com/movies.json');
+```

libs/plugins-runtime/src/lib/api/index.ts

@@ -152,6 +152,7 @@ export function createApi(manifest: Manifest) {
 
       return selection;
     },
+    fetch,
   } as const;
 
   return penpot;

libs/plugins-runtime/src/lib/index.d.ts

@@ -40,7 +40,8 @@ interface Penpot {
   ) => void;
   getFileState: () => File;
   getPageState: () => Page;
-  getSelection: () => any;
+  getSelection: () => string | null;
+  fetch: typeof fetch;
 }
 
 declare namespace globalThis {