Expose org.json.JSONObject.from method

[darind]

Related to #1500

Added org.json.JSONObject.from method allowing to marshal javascript objects to the corresponding JSONObject or JSONArray.

Example:

let obj = {
    prop1: "prop1 value",
    prop2: 123,
    prop3: {
        prop4: "prop 4 value"
    }
};
let jsonObj = org.json.JSONObject.from(obj);
jsonObj instanceof org.json.JSONObject; // true

or with arrays:

let arr = [{
    prop1: "item 1 value"
}, {
    prop1: "item 2 value"
}];
let jsonObj = org.json.JSONObject.from(obj);
jsonObj instanceof org.json.JSONArray; // true