feat: allow useAsyncFunction use with predefined error ref

This is helpful if multiple operations should use the same error object.

src/util.ts

@@ -36,9 +36,13 @@ export const useId = (() => {
   }
 })()
 
-export function useAsyncFunction<F extends (...args: never[]) => Promise<unknown>>(fn: F) {
+type UseAsyncFunctionOptions = { error?: Ref<Error | undefined> }
+export function useAsyncFunction<F extends (...args: never[]) => Promise<unknown>>(
+  fn: F,
+  options: UseAsyncFunctionOptions | undefined = undefined,
+) {
   const isProcessing = ref(false)
-  const error = ref<Error | undefined>()
+  const error = options?.error ?? ref<Error | undefined>()
 
   async function wrapper(...args: Parameters<F>): Promise<Awaited<ReturnType<F>>> {
     isProcessing.value = true