Removing Newtonsoft.Json

[phongnguyend]

How to migrate from Newtonsoft.Json to System.Text.Json

dotnet/core#5889 (comment)

Notes:

Newtonsoft.Json	System.Text.Json
using Newtonsoft.Json;	using System.Text.Json;
JsonConvert.DeserializeObject	JsonSerializer.Deserialize
JsonConvert.SerializeObject	JsonSerializer.Serialize
JsonSerializerSettings	JsonSerializerOptions
Formatting.None	JsonSerializerOptions.WriteIndented = false
Formatting.Indented	JsonSerializerOptions.WriteIndented = true
default	JsonSerializerOptions.PropertyNameCaseInsensitive = true
default	JsonSerializerOptions.NumberHandling = JsonNumberHandling.AllowReadingFromString
JsonSerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver()	JsonSerializerOptions.PropertyNamingPolicy = JsonNamingPolicy.CamelCase
JsonSerializerSettings.ObjectCreationHandling = ObjectCreationHandling.Replace	default
JsonSerializerSettings.NullValueHandling = NullValueHandling.Ignore	JsonSerializerOptions.IgnoreNullValues = true
JsonSerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore	JsonSerializerOptions.ReferenceHandler = ReferenceHandler.IgnoreCycles
JsonSerializerSettings.StringEscapeHandling= StringEscapeHandling.EscapeHtml	default