Add back net5.0; and revert changes for streaming APIs

src/Microsoft.Kiota.Abstractions.csproj

@@ -6,7 +6,7 @@
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <AssemblyTitle>Kiota Abstractions Library for dotnet</AssemblyTitle>
     <Authors>Microsoft</Authors>
-    <TargetFrameworks>netstandard2.0;netstandard2.1;net6.0;net7.0;net8.0;</TargetFrameworks>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;net5.0;net6.0;net7.0;net8.0;</TargetFrameworks>
     <LangVersion>latest</LangVersion>
     <PublishRepositoryUrl>true</PublishRepositoryUrl>
     <PackageIconUrl>http://go.microsoft.com/fwlink/?LinkID=288890</PackageIconUrl>

src/serialization/KiotaSerializer.Deserialization.cs

@@ -31,7 +31,9 @@ private static Stream GetStreamFromString(string source)
     {
         var stream = new MemoryStream();
         using var writer = new StreamWriter(stream, Encoding.UTF8, 1024, true);
-        writer.Write(source);
+
+        // Some clients enforce async stream processing.
+        writer.WriteAsync(source).GetAwaiter().GetResult();
         writer.Flush();
         stream.Position = 0;
         return stream;

src/serialization/KiotaSerializer.Serialization.cs

@@ -70,7 +70,9 @@ public static partial class KiotaSerializer
     private static string GetStringFromStream(Stream stream)
     {
         using var reader = new StreamReader(stream);
-        return reader.ReadToEnd();
+
+        // Some clients enforce async stream processing.
+        return reader.ReadToEndAsync().GetAwaiter().GetResult();
     }
     private static ISerializationWriter GetSerializationWriter(string contentType, object value)
     {