Fix JsonHelper.Format failing when deserializing top-level array objects

[rahman-ben]

Adds appropriate test cases to JsonHelperTests

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• UI change (please include screenshot!)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Internationalization and localization
• Other (please describe):

What is the current behavior?

Current behavior will deserialize the Input field of the JsonFormatter as a JObject, which will work as expected for top-level values and object definitions. But when the top-level object is an array, it cannot be serialized to this type, and instead writes the exception body to the Output.

Issue Number: #620

What is the new behavior?

The new behavior deserializes the Input text as a JToken, which is able to represent both JObject and JArray types. To handle sorting properties recursively, I created an overload of JsonFormatter.SortJsonPropertiesAlphabetically for JArray objects. Both methods were modified to recursively call eachother based on the property's JToken type.

Other information

Quality check

Before creating this PR, have you:

• Followed the code style guideline as described in CONTRIBUTING.md
• Verified that the change work in Release build configuration
• Checked all unit tests pass

[veler]

Thank you very much for this contribution! It looks great! :D