Add snippet showing system bar protection.

[ashnohe]

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Status bar has a gradient behind it so scrolling content doesn't clash with the status bar icons. Navigation bar is translucent so that buttons are visible as content scrolls behind.

Status bar and nav bar will look mostly like this (except navigation bar color will be a bit whiter):

https://github.com/user-attachments/assets/eb30909e-d681-484c-bdb2-38fd736bb6e9

Is this UI showing the scrolling list okay or should it be simplified?

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 1 region tag.

• compose/snippets/src/main/java/com/example/compose/snippets/layouts/SystemBarProtectionSnippets.kt:52, tag android_compose_system_bar_protection

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