Added humanReadable boolean to editorStateToJSON

[mwilkinson22]

editorStateToJSON always returns stringified JSON with indents and newlines. If we want to "minify" this before storing in the database, we need to do something like JSON.stringify(JSON.parse(editorStateToJSON(editorState)))

I've added a second parameter to editorStateToJSON, to optionally turn off newlines and indents and allow us to skip this step. It defaults to true, so shouldn't cause any breaking changes

[stale]

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