Pledge Screen - Load User's Stored Cards

[ifbarrera]

📲 What

Load a user's stored cards from Graph.

🤔 Why

So users can select a real stored card to pledge with.

🛠 How

This PR does the following:

• loads a user's stored cards
• shows an error MessageBanner if the request fails

Note that this PR does not include the loading state for the cards.

👀 See

Logged In	Logged Out

♿️ Accessibility

N/A

🏎 Performance

N/A

✅ Acceptance criteria

Logged In

• with the Native Checkout Pledge View feature flag turned ON, navigate to any project and select any reward.
  PASS In the pledge screen, you should see your user's stored cards load in, with the "Add New Card" tile at the end.

Logged Out

• Make sure you are logged out. Then, with the Native Checkout Pledge View feature flag turned ON, navigate to any project and select any reward. In the pledge screen, you should see the Continue button. Tap continue and sign in.
  PASS After you sign in, you should see the sign in overlay dismiss, and your stored cards should load in, with the "Add New Card" tile at the end.

No Network Connectivity

• Logged in, make sure you have the Native Checkout Pledge View feature flag turned ON, navigate to any project. Turn off your internet (you can do this by turning airplane mode on your device to ON). Then, select any reward.
  PASS You should not see any cards loaded in. Then, after a few seconds, you should see an error banner appear with the message "Something went wrong".

[justinswart]

Looking pretty cool!

What do you think about making this edge to edge as part of this PR 🤔

I believe it's not meant to clip at these margins:

[justinswart]

Could we remove this type from the xib, seems to complain that it doesn't exist:

[justinswart]

Something else either as part of this or separately but we should probably float the card logo to the top:

[ifbarrera]

@justinswart I've added both of those visual styling comments to our ticket for iOS Checkout Polish

[justinswart]

Legit!