Paywalls Tester: App Store Prep

[jamesrb1]

This PR:

• Updates the bundle name to com.revenuecat.app (a new app in App Store Connect has been set up.)
• Updates the icon.
• Update the app's Display Name to Revenue Cat.
• Removes unneeded keys for "demos" and "testing".
• Changes how keys are stored/managed locally. I'm not completely happy with this arrangement, but I think it's an improvement because local keys are now stored in a separate file which can be marked as skip-worktree or assume-unchanged which hides them from the diff to help you not commit changes in it accidentally (which I have done).

For this to compile in release, and the demos tab to show up, the changes from this PR are needed.

[RevenueCat-Danger-Bot]

	1 Message
:book:	Size increase: 76.00 KB

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