Firebase migration from KTX to main module

[JakubPruszynski]

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The Kotlin extensions (KTX) APIs have been added to their respective main modules. For example, all the APIs from firebase-perf-ktx have been added to firebase-perf under the com.google.firebase.perf package. As part of this change, the Kotlin extensions (KTX) APIs in every KTX module are now deprecated. As early as April 2024, we'll no longer release KTX modules, and we'll also remove the KTX libraries from the Firebase Android BoM at that time.

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[StefMa]

Duplicate of https://github.com/GitLiveApp/firebase-kotlin-sdk/issues/451