Check if round tripping an operation's value is required

[kichalla]

We currently round trip the 'value' provided in an 'operation' here: https://github.com/aspnet/JsonPatch/blob/dev/src/Microsoft.AspNetCore.JsonPatch/Internal/ConversionResultProvider.cs#L15

Valid types in JSON: number, string, bool, array, object, null

Some things we need to verify in the above line of code:

• If the 'value' is of the same type as the 'typeToConvertTo', then we can avoid round tripping. This is being handled in the PR https://github.com/aspnet/JsonPatch/pull/63
• If the value is of type JArray or JObject, then we could use the ToObject on them: http://www.newtonsoft.com/json/help/html/M_Newtonsoft_Json_Linq_JToken_ToObject.htm

Some scenarios to consider if we plan to avoid round tripping: value type: string target type: System.Guid

value type: Int64 (default json.net type for integers) target type: Int32

@Eilon

[kichalla]

A working change (in my private branch): https://github.com/aspnet/JsonPatch/commit/7f7ff71bc00f3fece41ce77e95d2937954baf63b

[aspnet-hello]

This issue was moved to aspnet/Home#2435