feat: set useFetch promise$ initData

Author: yiludege

packages/core/useFetch/index.ts

@@ -126,7 +126,7 @@ export function useFetch<T>(
     payload: undefined as unknown,
   };
 
-  const promise$ = $<T>();
+  const promise$ = $<T>(fetchOptions?.initialData);
 
   const {
     fetch = window?.fetch,

packages/core/useFetch/type.ts

@@ -197,7 +197,7 @@ export interface UseFetchReturn<T> {
   /**
    * promise stream
    */
-  promise$: Stream<T>;
+  promise$: Stream<T | undefined, true>;
 
   /**
    * Manually call the fetch