Standardize wishlist returns

## Issue Type

Please select the type of issue you are reporting:

- Feature Request
- Discussion

## Description

Currently, the wishlist loaders return different types for each integration.

**VTEX**
````
const loader = async (
props: Props,
req: Request,
ctx: AppContext,
): Promise => {
````

**WAKE**
````
const action = async (
_props: unknown,
req: Request,
ctx: AppContext,
): Promise => {
````

## Expected Behavior

We expect the same type of return, so we can be able to reuse this result in front end components.

## Actual Behavior

This creates the problem of not being able to build canonical components on the front end.