Add option to preserve unicode character conversion

# Problem solved by the feature
In the current implementation, when we deserialize a JSON string to an object the Unicode character conversion is converted to the Unicode character. For example `\u0161` is converted to `š`. As a result, when we serialize back to JSON we get the Unicode character instead of the Unicode character conversion. Even though both strings `\u0161` and `š` are valid and the same, it's better to have the option to preserve the original string(`\u0161`) when we serialize back.

# Feature description
Add an option that will preserve `\u0161` as it when we deserialize or serialize back to JSON