[Request]: Add SDK Switcher #851

Is your request related to a problem?

Yes

How is the feature request related to the problem?

Currently the main Launcher while supports Google Play as a Separate region for Genshin Impact, it missing Honkai Impact 3rd as well Epic Games SDK for all HoYoverse titles (Honkai Impact 3rd only have America and Europe as its region for Epic).

This cause players to use the default Payment Processor provided by the miHoYo SDK and missing our rewards from services like cashback rewards on Epic or Google Play Point accumulation.

Describe your proposed solution

Add a Switch to allow user to switch between Epic, Google Play and Default. With Epic adding an additional check to see if Epic Games Store is open.

Describe alternatives you've considered

Alternatively we can create a new region for that, but the Switch is more preferred to keep the Launcher tidy.

Additional context

Developers can check the APIs from this website and figure how to implement it.
https://aapi.studiobutter.io.vn

Note: When using the Epic Games SDK, Epic Games Launcher MUST ALWAYS be active (either as a Tray, Background Task or Running Application), make sure Collapse can see if Epic Games is running otherwise the payment processor will not work and trying to close the game will freeze the game instead.