Eliminate Newtonsoft.Json

Your dependency on Newtonsoft.Json and use of Stream goes counter to everyone’s use of System.Text.Json and IBufferWriter<>

Describe the solution you’d like Now that System.Text.Json is netstandard2.0 you should get rid of Newtonsoft.Json

Additional context it creates dangling references that I do not want to carry around

The core cosmos API should limit itself to IBufferWriter<> and Span<T> and expose typed serialization as extensions

[DanielLarsenNZ]

When using the Cosmos SDK in ASP.NET Core 3.0 and .NET Core 3.0 today, we have to use Newtonsoft.Json, for its JsonPropertyAttribute to rename Id to id. Using System.Text.Json.Serialization attributes does not work. For example:

[Newtonsoft.Json.JsonProperty(PropertyName = "id")]
public string Id { get; set; }

IMO we should be able to use the native System.Text.Json.Serialization.JsonPropertyNameAttribute to rename properties for serialization. Same goes for Ignore, etc.

[ealsur]

The goal is for V4 not to have any Newtonsoft.Json dependency.