Write JSON to a file in the current working directory, or to a String.

• json: The object to write. Can either be a JSON instance or another Map/List implementation. Both are supported.
• file (optional): Optional path to a file in the workspace to write to. If provided, then returnText must be false or omitted. It is required that either file is provided, or returnText is true.
• pretty (optional): Prettify the output with this number of spaces added to each level of indentation.
• returnText (optional): Return the JSON as a string instead of writing it to a file. Defaults to false. If true, then file must not be provided. It is required that either file is provided, or returnText is true.

Example:
Writing to a file:

        def amap = ['something': 'my datas',
                    'size': 3,
                    'isEmpty': false]

        writeJSON file: 'data.json', json: amap
        def read = readJSON file: 'data.json'

        assert read.something == 'my datas'
        assert read.size == 3
        assert read.isEmpty == false
        

        def amap = ['something': 'my datas',
                    'size': 3,
                    'isEmpty': false]

        String json = writeJSON returnText: true, json: amap
        def read = readJSON text: json

        assert read.something == 'my datas'
        assert read.size == 3
        assert read.isEmpty == false