chore: add snippets for isOpen

[wangela]

• add documentation snippets for isOpen in Java and Kotlin
• add missing license headers

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• snippets/app/src/main/java/com/google/places/PlaceIsOpenActivity.java:45, tag maps_places_place_is_open
• snippets/app/src/main/java/com/google/places/PlaceIsOpenActivity.java:94, tag maps_places_id_is_open
• snippets/app/src/main/java/com/google/places/kotlin/PlacesIsOpenActivity.kt:37, tag maps_places_place_is_open
• snippets/app/src/main/java/com/google/places/kotlin/PlacesIsOpenActivity.kt:86, tag maps_places_id_is_open

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[sgilsonapigee]

Thanks!