Ignore persistToLocalStorage in headless mode

Summary:
In a headless mode we do not have access to local storage. As a result, headless plugins that try to use `persistToLocalStorage` option crash. We should ignore the option for these plugins for now and add a way to persist the plugin state to the disk in a headless mode in the future.

CHANGELOG: Ignore persistToLocalStorage in headless mode

Resolves https://github.com/facebook/flipper/issues/4190

Reviewed By: lblasa

Differential Revision: D40341873

fbshipit-source-id: 40774c0024f79cf1652f24146fd16f6a101ca99e

desktop/flipper-plugin-core/src/index.tsx

@@ -54,6 +54,8 @@ export {createDataSource} from './state/createDataSource';
 
 export {
   createState,
+  _setAtomPersistentStorage,
+  AtomPersistentStorage,
   Atom,
   isAtom,
   ReadOnlyAtom as _ReadOnlyAtom,