Add new parameter as `rememberGooglePayLauncher`

[winter-love-dev]

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Summary

Added optional publishableKey parameter to rememberGooglePayLauncher() to allow direct key specification without modifying singleton configuration.

• https://github.com/stripe/stripe-android/issues/10937

Motivation

Eliminates need to reinitialize PaymentConfiguration singleton when switching between different country-specific publishable keys, reducing code complexity and preventing potential race conditions.

Testing

• [x] Added tests
• [x] Modified tests
• [ ] Manually verified

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[cla-assistant[bot]]

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[tianzhao-stripe]

Hi @winter-love-dev

Thanks for your contribution, we've added this to our roadmap and we're working on getting it approved and added!