Add wrapper functions for JSON Built-in functions in package space

[OceanOak]

We want to add Json package functions to wrap the existing built-in functions jsonSerialize and jsonParse

Example:

let serialize<'a> (a: 'a) : String =
  Builtin.jsonSerialize<'a> a

When executing the test Stdlib.Json.serialize<Int64> 0L = "0" we encounter the following error:

Unsupported type in JSON: 'a. Some types are not supported in Json serialization, and cannot be used as arguments to Builtin.jsonParse or Builtin.jsonSerialize

The built-in function is called with the generic type 'a instead of the actual type (e.g. Int64) that was passed in the package function.

Goal: ensure the actual type is properly passed to the built-in function