add in initial wishlist api functions and hooks

lib/bigcommerce/api/wishlist/handlers/get-wishlist.ts

@@ -0,0 +1,21 @@
+import { BigcommerceApiError } from '../../utils/errors'
+import type { Wishlist, WishlistHandlers } from '..'
+
+// Return wishlist info
+const getWishlist: WishlistHandlers['getWishlist'] = async ({
+  res,
+  body: { wishlistId },
+  config,
+}) => {
+  let result: { data?: Wishlist } = {}
+
+  try {
+    result = await config.storeApiFetch(`/v3/wishlists/${wishlistId}`)
+  } catch (error) {
+    throw error
+  }
+
+  res.status(200).json({ data: result.data ?? null })
+}
+
+export default getWishlist