Fix code to show imports in Wear migration guidance

[kul3r4]

Readd imports that were lost in previous PRs to show the imports that are useful in the Wear M3 migration guidance.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• wear/src/main/java/com/example/wear/snippets/m3/theme/Color.kt:21, tag android_wear_color
• wear/src/main/java/com/example/wear/snippets/m3/theme/Shape.kt:18, tag android_wear_shape
• wear/src/main/java/com/example/wear/snippets/m3/theme/Theme.kt:21, tag android_wear_material_theme
• wear/src/main/java/com/example/wear/snippets/m3/theme/Typography.kt:18, tag android_wear_typography

You are about to delete 4 region tags.

• wear/src/main/java/com/example/wear/snippets/m3/theme/Color.kt:36, tag android_wear_color
• wear/src/main/java/com/example/wear/snippets/m3/theme/Shape.kt:21, tag android_wear_shape
• wear/src/main/java/com/example/wear/snippets/m3/theme/Theme.kt:32, tag android_wear_material_theme
• wear/src/main/java/com/example/wear/snippets/m3/theme/Typography.kt:21, tag android_wear_typography

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[ithinkihaveacat]

Being able to see the exact import is a good benefit of snippets, but I wonder if they can just be left in the GH source, rather than being visible on DAC. Among other things, you can only do this for the first snippet in the file (because of the way the EXCLUDE mechanism works).

[kul3r4]

agree this approach has limitations and I have been trying to find other ways without much success. This case for showing imports is only for the migration guidance where we wanted to show the imports for clarity but unfortunately imports cannot be duplicated in the same file, so the only alternative is to create a new file for each one