Json serialization (#1431)

* Json serialization

Parameterless constructor restriction removed

* Json serialization

Minor change, json serializer restricted to class

Co-authored-by: Kostadin Mitevski <[email protected]>

Author: appleseed7even

src/Confluent.SchemaRegistry.Serdes.Json/JsonDeserializer.cs

@@ -46,7 +46,7 @@ namespace Confluent.SchemaRegistry.Serdes
     ///     integration of System.Text.Json and JSON Schema, so this
     ///     is not yet supported by the deserializer.
     /// </remarks>
-    public class JsonDeserializer<T> : IAsyncDeserializer<T> where T : class, new()
+    public class JsonDeserializer<T> : IAsyncDeserializer<T> where T : class
     {
         private readonly int headerSize =  sizeof(int) + sizeof(byte);
 

src/Confluent.SchemaRegistry.Serdes.Json/JsonSerializer.cs

@@ -53,7 +53,7 @@ namespace Confluent.SchemaRegistry.Serdes
     ///     integration of System.Text.Json and JSON Schema, so this
     ///     is not yet supported by the serializer.
     /// </remarks>
-    public class JsonSerializer<T> : IAsyncSerializer<T>  where T : new()
+    public class JsonSerializer<T> : IAsyncSerializer<T> where T : class
     {
         private const int DefaultInitialBufferSize = 1024;