Remove the use of now deprecated Kotlin Android Extensions

[puneet-pdx]

At the latest version of the Kotlin Gradle plugin 1.4.21 Kotlin Android Extensions is deprecated, implying using Kotlin synthetics for view binding is no longer supported. Android recommends migrating from Kotlin synthetics to Jetpack View binding.

https://developer.android.com/topic/libraries/view-binding/migration
https://proandroiddev.com/migrating-the-deprecated-kotlin-android-extensions-compiler-plugin-to-viewbinding-d234c691dec7