2413 fix

[arjun12102019]

What this PR does / why we need it?

JSONObject.from(Object obj)
Currently we have only method which expects type Object and getting class cast exception when we pass string

Summary of your change

Overloaded method for String argument and invoking JSON.parseObject(text) to return JSONObject

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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[wenshao]

please sign CLA