Android: Add Snackbar UI component

[syntaxerror247]

This PR introduces a Snackbar UI component, providing a native, touch-friendly in-app notification system. The Snackbar is designed to display temporary messages without blocking user interaction and includes an optional action button. It can be dismissed after a certain duration or by swiping.

I would like to integrate this into some parts of the Android Editor. However, since we are currently in a feature freeze, this PR only adds the component itself without exposing it or integrating it into the Android Editor yet. The integration will be done in follow-up PRs as needed during the 4.5 dev cycle.

Currently, this Snackbar is needed for and will be used in #102492.

Screenrecorder-2025-02-08-19-24-56-778.mp4

[m4gr3d]

Looks great!

[akien-mga]

Clarifying for other reviewers that we're in feature freeze, so normally such additions would be out of scope. But we're making an exception here for two reasons:

• This is needed for a good UX in Add support for embedding game process in the Android Editor #102492, which implements feature parity for the Android editor with the embedded game process added for Windows and Linux in 4.4. So it's technically completing a 4.4 feature for one platform.
• The Android editor is still experimental and the Android team maintainers support this late addition, so we defer to them. This doesn't affect other platforms.

[akien-mga]

Thanks!