feat: copies some snippets that were in v3 only to gms

[dkhawk]

chore: the java compatibility version

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 10 region tags.

• snippets/app/src/gms/java/com/google/maps/example/AdvancedMarkersCollisionActivity.java:35, tag maps_android_marker_collision
• snippets/app/src/gms/java/com/google/maps/example/CloudBasedMapStylingActivity.java:29, tag maps_android_cloud_based_map_styling
• snippets/app/src/gms/java/com/google/maps/example/PolylineCustomizationActivity.java:36, tag maps_android_polyline_multicolored
• snippets/app/src/gms/java/com/google/maps/example/PolylineCustomizationActivity.java:45, tag maps_android_polyline_gradient
• snippets/app/src/gms/java/com/google/maps/example/PolylineCustomizationActivity.java:53, tag maps_android_polyline_stamped
• snippets/app/src/gms/java/com/google/maps/example/kotlin/AdvancedMarkersCollisionActivity.kt:30, tag maps_android_marker_collision
• snippets/app/src/gms/java/com/google/maps/example/kotlin/CloudBasedMapStylingActivity.kt:26, tag maps_android_cloud_based_map_styling
• snippets/app/src/gms/java/com/google/maps/example/kotlin/PolylineCustomizationActivity.kt:32, tag maps_android_polyline_multicolored
• snippets/app/src/gms/java/com/google/maps/example/kotlin/PolylineCustomizationActivity.kt:43, tag maps_android_polyline_gradient
• snippets/app/src/gms/java/com/google/maps/example/kotlin/PolylineCustomizationActivity.kt:60, tag maps_android_polyline_stamped

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[kikoso]

LGTM! We increased Java through the repo to 21.

[googlemaps-bot]

🎉 This PR is included in version 1.12.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀