Install prompt snippet

[garanj]

Adds snippet for Playcore install prompt library

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• installprompt/build.gradle.kts:51, tag android_installprompt_dependency
• installprompt/src/main/java/com/example/crossdeviceinstallprompt/MainActivity.kt:82, tag android_installprompt_launch

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[gemini-code-assist]

Code Review

This pull request introduces a new module, :playcore:installprompt, which implements a sample application demonstrating the Google Play Cross-Device Install Prompt library. The feedback focuses on improving dependency management by utilizing the project's version catalog in build.gradle.kts and enhancing code safety in MainActivity.kt by replacing a non-null assertion with a null-safe check for the current activity.