Remove packages that are now maintained in other repositories.

[jpobst]

We have moved many of the most popular packages needed for the .NET Android ecosystem into other repositories that are officially supported by Microsoft. This ensures that they stay maintained and up-to-date. This PR removes these libraries from this repository to ensure there is no confusion about where the source code for them lives.

Moved libraries:

NuGet Package	Moved To
Xamarin.Android.Glide.DiskLruCache	GPS
Xamarin.Android.Glide.GifDecoder	GPS
Xamarin.Android.Glide.RecyclerViewIntegration	GPS
Xamarin.Android.Glide	GPS
Xamarin.Google.Android.DataTransport.TransportApi	GPS
Xamarin.Google.Android.DataTransport.TransportBackendCct	GPS
Xamarin.Google.Android.DataTransport.TransportRuntime	GPS
Xamarin.Google.Android.Play.Core	GPS
Xamarin.Google.AutoValue.Annotations	AndroidX
Xamarin.Android.Google.BillingClient	GPS
Xamarin.Google.Dagger	GPS
GoogleGson	AndroidX
Xamarin.Google.ZXing.Core	GPS
Xamarin.Google.Guava.FailureAccess	AndroidX
Xamarin.Google.Guava.ListenableFuture	AndroidX
Xamarin.Google.Guava	AndroidX
Xamarin.CheckerFramework.CheckerCompatQual	AndroidX
Xamarin.Google.J2Objc.Annotations	AndroidX
Xamarin.Io.OpenCensus.OpenCensusApi	GPS
Xamarin.Io.OpenCensus.OpenCensusContribGrpcMetrics	GPS
Xamarin.Io.PerfMark.PerfMarkApi	GPS
Xamarin.JavaX.Inject	GPS
Xamarin.KotlinX.Coroutines.Android	AndroidX
Xamarin.KotlinX.Coroutines.Core.Jvm	AndroidX
Xamarin.KotlinX.Coroutines.Core	AndroidX
Xamarin.KotlinX.Coroutines.Jdk8	AndroidX
Xamarin.KotlinX.Coroutines.Reactive	AndroidX
Xamarin.KotlinX.Coroutines.Rx2	AndroidX
Xamarin.Protobuf.JavaLite	GPS
Xamarin.Android.ReactiveStreams	AndroidX
Xamarin.Android.ReactiveX.RxAndroid	AndroidX
Xamarin.Android.ReactiveX.RxJava	AndroidX
Xamarin.Android.ReactiveX.RxKotlin	AndroidX
Xamarin.Android.ReactiveX.RxJava3.RxAndroid	AndroidX
Xamarin.Android.ReactiveX.RxJava3.RxJava	AndroidX
Xamarin.Android.ReactiveX.RxJava3.RxKotlin	AndroidX
Square.OkHttp	GPS
Square.OkHttp3	GPS
Square.OkHttp3.LoggingInterceptor	GPS
Square.OkHttp3.UrlConnection	GPS
Square.OkIO	GPS
Square.Retrofit	GPS
Square.Retrofit2	GPS
Square.Retrofit2.AdapterRxJava2	GPS
Square.Retrofit2.ConverterGson	GPS
Square.Retrofit2.ConverterScalars	GPS
Xamarin.Android.Volley	GPS
Xamarin.Chromium.CroNet.Api	GPS
Xamarin.Chromium.CroNet.Common	GPS
Xamarin.Chromium.CroNet.Embedded	GPS
Xamarin.Chromium.CroNet.FallBack	GPS
Xamarin.Grpc.Android	GPS
Xamarin.Grpc.Api	GPS
Xamarin.Grpc.Context	GPS
Xamarin.Grpc.Core	GPS
Xamarin.Grpc.OkHttp	GPS
Xamarin.Grpc.Protobuf.Lite	GPS
Xamarin.Grpc.Stub	GPS
Xamarin.Protobuf.Lite	GPS
Xamarin.TensorFlow.Lite	GPS
Xamarin.TensorFlow.Lite.Gpu	GPS
Xamarin.Jetbrains.Annotations	AndroidX
Xamarin.Kotlin.Reflect	AndroidX
Xamarin.Kotlin.StdLib.Jdk7	AndroidX
Xamarin.Kotlin.StdLib.Jdk8	AndroidX
Xamarin.Kotlin.StdLib	AndroidX
Square.Picasso	GPS