Use Partial instead of RecursivePartial for persisted state

The current state metadata takes an all-or-nothing approach to
persisting each state property. There is no mechanism for omitting
nested properties from the persisted state. As such, `Partial` is a
better description of the return type than `RecursivePartial`.

src/BaseControllerV2.ts

@@ -194,12 +194,12 @@ export function getAnonymizedState<S extends Record<string, any>>(
 export function getPersistentState<S extends Record<string, any>>(
   state: S,
   metadata: StateMetadata<S>,
-): RecursivePartial<S> {
+): Partial<S> {
   return Object.keys(state).reduce((persistedState, _key) => {
     const key: keyof S = _key; // https://stackoverflow.com/questions/63893394/string-cannot-be-used-to-index-type-t
     if (metadata[key].persist) {
       persistedState[key] = state[key];
     }
     return persistedState;
-  }, {} as RecursivePartial<S>);
+  }, {} as Partial<S>);
 }