Android First Party Migration Plan & Removing Deprecated Code

First Party Migration Plan

We'll be migrating first party specific code into the internal flavor. This will ensure first party still works as intended while cleaning up the API for third party release.

PayPalCheckoutSdk

1. Remove all deprecated third party functionality.
2. Move PayPalCheckoutSdk into internal flavor.
3. Migrate Dagger SdkComponent initialization to work with both PayPalCheckoutSdk & PayPalCheckout.
   3a. We could move this into DebugConfigManager and that would resolve the issue for both platforms.
4. Migrate cancelCheckoutAndExit to be outside of PayPalCheckoutSdk as it's used by PYPLCheckoutUtils.
5. Delete external tester activity that use PayPalCheckoutSdk and only use activities that use PayPalCheckout.
6. PayPalCheckoutSdk.startCheckoutWithIntentUri should accept an ExtendedCheckoutConfig instead of a CheckoutConfig.

ExtendedCheckoutConfig

1. Becomes a top level class, copy over values from CheckoutConfig into ExtendedCheckoutConfig.

CheckoutConfigNew

1. Rename to CheckoutConfig.

PayPalCheckout

1. Remove PayPalCheckoutSdk dependency (currently sets app).

Removing Deprecated Code

We should remove all code that is under a @Deprecated annotation.

MainPaysheetViewModel

1. Remove old create order flows. Startng with CreateOrderApi and working our way back would probably be best.

FoundationRiskConfig

1. Clean up FoundationRiskConfig and remove deprecated code. Ensure auth still works for third party.