Updates the MessageSerializer to store the json value as the actual json object in the data field.

[GarrettBeatty]

Issue #, if available: #168

Description of changes:

1. Updates the MessageSerializer to store the json value as the actual json object in the data field.
2. Add datacontenttype field to message
3. Right now its pointing to refactor2 branch since that PR to be merged first

Before

{
    "version": "0",
    "id": "359472c2-c66b-00df-5976-cef04c383a15",
    "detail-type": "Payload",
    "source": "/aws/messaging",
    "account": "147997163238",
    "time": "2025-03-14T18:40:58Z",
    "region": "us-east-1",
    "resources": [],
    "detail": {
        "id": "fdc50c90-f747-4794-ae91-d39894cc6442",
        "source": "/aws/messaging",
        "specversion": "1.0",
        "type": "Payload",
        "time": "2025-03-14T18:40:56.3356898+00:00",
        "data": "{\"Id\":\"8b939477-089c-49ce-ae90-49e9817bd593\",\"Name\":\"Test\",\"SomeValue\":42}"
    }

After

{
    "version": "0",
    "id": "ce7c8a25-da87-879d-100c-874adbaf9c51",
    "detail-type": "Payload",
    "source": "/aws/messaging",
    "account": "147997163238",
    "time": "2025-03-14T19:03:10Z",
    "region": "us-east-1",
    "resources": [],
    "detail": {
        "id": "0ef8cf5e-938a-4dc8-9b62-c6ccb3344bc7",
        "source": "/aws/messaging",
        "specversion": "1.0",
        "type": "Payload",
        "time": "2025-03-14T19:03:08.4022404+00:00",
        "datacontenttype": "application/json",
        "data": {
            "Id": "0172a7de-3757-4740-a771-4aca5f05d67c",
            "Name": "Test",
            "SomeValue": 42
        }
    }
}

Testing

1. I followed the steps in Not properly formatting the data element of the MessageEnvelope #168 (comment) to validate the before and after

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[GarrettBeatty]

these had to be updated because the previously used JsonSerializer.Deseerialize which doesnt work anymore with new format

[GarrettBeatty]

closing this and will reopen on v4 development branch