Bug: Multiple addMetrics() calls should not override each other but push more value into the array in EMF

[ijemmy]

This changes should be in:

1. Code
2. Unit test
3. Doc
4. Example

Example code

metrics.addMetric(name="successfulBooking", unit=MetricUnit.Count, value=1)
metrics.addMetric(name="successfulBooking", unit=MetricUnit.Count, value=2)

Expected result

{
    "_aws": {
        "Timestamp": 1641204548165,
        "CloudWatchMetrics": [
            {
                "Namespace": "DummyNameSpace",
                "Dimensions": [
                    [
                        "service"
                    ]
                ],
                "Metrics": [
                    {
                        "Name": "successfulBooking",
                        "Unit": "Count"
                    }
                ]
            }
        ]
    },
    "service": "Dummy",
    "successfulBooking": [
        1.0,
        2.0
    ]
}

[github-actions]

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