Add jsonutils module.

[pramodya1994]

Purpose

This module restores removed json.toXML functionality.

import ballerina/jsonutils;

function testToXml() returns xml {
    json data = {
        name: "John",
        age: 30
    };
    xml x = jsonutils:toXML(data);
    return x;
}

x will be <name>John</name><age>30</age>

Fixes #

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

Check List

• Read the Contributing Guide
• Required Balo version update
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov-io]

Codecov Report

Merging #18474 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #18474   +/-   ##
=======================================
  Coverage   15.15%   15.15%           
=======================================
  Files          48       48           
  Lines        1254     1254           
  Branches      197      197           
=======================================
  Hits          190      190           
  Misses       1050     1050           
  Partials       14       14

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[SupunS]

incorrect formatting