[GH-437] Claim dungeon AFK Rewards

[ncontinanza]

Closes #437

Motivation

We need to claim the AFK rewards every time the user goes to the Dungeon Settlement

Summary of changes

• Claim AFK rewards when entering the Dungeon Settlement scene

How has this been tested?

1. Start the backend using the main branch. Before doing it, you may want to edit apps/champions/priv/dungeon_settlement_levels.json and increase the amount of afk supplies provided by the first Dungeon level. Changing it to 1440 will give you 1 supply per minute, and you won't need to wait that long to test this behaviour.
2. Get your user in the backend and check the initial amount of supplies. To do so, you can run {:ok, user} = Champions.Users.get_user(user_id) and then user.currencies to see the available currencies.
3. Wait a few moments (depending of what you did in step 1) and go to the Dungeon Settlement scene.
4. Get your user from the backend again, and check that the claimed supplies were added.

You'll notice that if you come back and forth from that scene during the waiting time, you won't receive any rewards despite how long you wait. We'll address this problem in this issue: #491

Test additions / changes

List tests added/updated.

Checklist

• I have tested the changes locally.
• I self-reviewed the changes on GitHub, line by line.
• Tests have been added/updated.
• This change requires new documentation.
  • Documentation has been added/updated.
• I have tested the changes in another devices.
  • Tested in iOS.
  • Tested in Android.

[lotuuu]

Let's make the claim happen on Dungeon scene instead of DungeonSettlementScene. The idea is that it will look like it is seamlessly applying your rewards every 20 minutes or so, while not needing a job to trigger every said amount of time. Instead, when we would display the currency to the user, we first calculate all the accumulated rewards.

Also, if we could add the supplies to the header as related currency there that'd be great and really tie all this functionality together

[alfopisano]

Nice!!