Introduce isObject option for unpaired tags

[c100k]

• [x] Are you running the latest version?
• [x] Have you included sample input, output, error, and expected output?
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Description

Unpaired tags are parsed into an empty string. But in some cases, it should be something else. Like an object for example. In the same style of [`isArray`](https://github.com/NaturalIntelligence/fast-xml-parser/blob/master/docs/v4/2.XMLparseOptions.md#isarray), we could introduce an `isObject` option, working the same way. ### Input

Let's take for example the following XML:

<Response>
    <id>123</id>
    <dataSet/>
</Response>

Code

https://naturalintelligence.github.io/fast-xml-parser/

Output

It gives the following output:

{
    "?xml": "",
    "Response": {
        "id": 123,
        "dataSet": ""
    }
}

expected data

I would instead expect the following result:

{
    "?xml": "",
    "Response": {
        "id": 123,
        "dataSet": {}
    }
}

Would you like to work on this issue?

• [ ] Yes
• [ ] No

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[amitguptagwl]

I've took care of this in v5.