feat: add support for API 35 EdgeToEdge

[Lyokone]

Hey there! So you want to contribute to FirebaseUI? Before you file this pull request, follow these steps:

• Read the contribution guidelines.
• Run ./gradlew check to ensure the Travis build passes.
• If this has been discussed in an issue, make sure to mention the issue number here. If not, go file an issue about this to make sure this is a desirable change.
• If this is a new feature please co-ordinate with someone on FirebaseUI-iOS to make sure that we can implement this on both platforms and maintain feature parity.

[thatfiredev]

We need some padding on the screen that is shown when the user is signed in:

[Lyokone]

Added more padding @thatfiredev

[luokailiang]

When will this feature be released?

[tosuccesspractice]

When will this feature be released?

[SeanBlahovici]

With API 36 released, we cannot upgrade without this fix, the workaround no longer works. Please release this as soon as possible!

[vegeta2102]

When will edgeToEdge support be released ?

[sun-with]

When will this feature be released？ 💦

[ArcherEmiya05]

This fix is incomplete or incorrect at all, it doesn't provide backward compatibility and doesn't follow the documentation for handling edge-to-edge. Additionally use padding instead of margin for better result.

Not working on older Android version (versions prior to 15)

Statusbar content has no contrast thus battery percentage and other icons are no longer visible.