Function flatten

Flatten the parameters object into a single level object that can be used as query parameters.

For example, the following object:

{
   "a": 1,
   "b": {
      "c": 2,
     "d": [3, 4]
  }
}
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Will be flattened into:

{
  "a": "1",
  "b[c]": "2",
  "b[d][0]": "3",
  "b[d][1]": "4"
}
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