Issue serializing List<KeyValuePair<string,string>> in camelCase

[reddyrajanala]

//I am unable to serialize List<KVP<string,string>> with kvp names as "key"/"value"
//similarly cannot deserialize
//See the snippet below
`
using System;
using Utf8Json;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using Utf8Json.Resolvers;
using Utf8Json.Formatters;

public class Program
{
public static void Main()
{

	CompositeResolver.RegisterAndSetAsDefault(
		new IJsonFormatter[] {new KeyValuePairFormatter<string, string>()},  //this did not help
		new[] {StandardResolver.CamelCase});


	var p = new Person{
	 FirstName = "Bob",
		LastName ="Smith",
		Others = new List<KeyValuePair<string, string>>
		{
			new KeyValuePair<string, string>("foo1", "bar1"),
			new KeyValuePair<string, string>("foo2", "bar2"),
			new KeyValuePair<string, string>("foo3", "bar3"),
		}
	};

	var utf8SerializedJson = Utf8Json.JsonSerializer.ToJsonString(p, Utf8Json.Resolvers.StandardResolver.CamelCase);
	Console.WriteLine(utf8SerializedJson);
	//ouptput : note "Key" and "Value" names are not in camelcase
	//{"firstName":"Bob","lastName":"Smith","others":[{"**Key**":"foo1","**Value**":"bar1"},{"Key":"foo2","Value":"bar2"},{"Key":"foo3","Value":"bar3"}]}


	
	var newtonSoftSerializedJson = Newtonsoft.Json.JsonConvert.SerializeObject(p, new JsonSerializerSettings 
{ 
    ContractResolver = new CamelCasePropertyNamesContractResolver() 
});
	Console.WriteLine(newtonSoftSerializedJson);
	//output : note "key" and "value" are in camelcase
	//{"firstName":"Bob","lastName":"Smith","others":[{"key":"foo1","value":"bar1"},{"key":"foo2","value":"bar2"},{"key":"foo3","value":"bar3"}]}

	
	//key and value as "Key" and "Value" - desierializes as expected
	var ds1 = @"{""firstName"":""Sri"",""lastName"":""Raj"",""others"":[{""Key"":""foo1"",""Value"":""bar1""},{""Key"":""foo2"",""Value"":""bar2""},{""Key"":""foo3"",""Value"":""bar3""}]}";

	var person1 = Utf8Json.JsonSerializer.Deserialize<Person>(ds1);
	Console.WriteLine(person1.Others.First().Key + "-" + person1.Others.First().Value );

	//key and value as "key" and "value" - fails to deseiralize as expected
    var ds2 = @"{""firstName"":""Sri"",""lastName"":""Raj"",""others"":[{""key"":""foo1"",""value"":""bar1""},{""key"":""foo2"",""value"":""bar2""},{""key"":""foo3"",""value"":""bar3""}]}";
	
	var person2 = Utf8Json.JsonSerializer.Deserialize<Person>(ds2);

	//expected: "foo1 - bar1" actual: " - "
	Console.WriteLine(person2.Others.First().Key + "-" + person2.Others.First().Value );
	
}

public class Person
{
	public string FirstName{get;set;}
	public string LastName{get;set;}
	public List<KeyValuePair<string, string>> Others {get;set;}
}

}
`

[bokmadsen]

I've looking for the same solution, but it's not easy. It would require a modification of the code because it's hardcoded to instantiate the builtin KeyValueFormatter here :

Utf8Json/src/Utf8Json/Resolvers/DynamicGenericResolver.cs

Line 124 in 608cf01

return CreateInstance(typeof(KeyValuePairFormatter<,>), ti.GenericTypeArguments);

I don't think a PR would be enough, as it seems the project is abandoned