Add search section divider

[takahirom]

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• We can use this https://github.com/DroidKaigi/conference-app-2019/blob/master/feature/sponsor/src/main/java/io/github/droidkaigi/confsched2019/sponsor/ui/item/DividerItem.kt

[NUmeroAndDev]

🙋‍♂️

[tomoya0x00]

Thank you always! Assigned😊