Add new RepoSearch sample app using Android views

[veyndan]

Unfortunately, Jetpack Compose UI hasn't completely taken over the Android world yet. In the meantime, having a sample app powered by Android views would demonstrate that there is a zero-cost migration from AndroidX Paging to Multiplatform Paging in your UI layer (because android-view wouldn't directly depend on Multiplatform Paging, and you'll continue to use the artifacts provided by AndroidX Paging). The sample will have a transitive dependency on Multiplatform Paging via the existing shared module though.