Handle both object and string LogEventRecord types in json Unmarshal

[estolfo]

The Logs API can set either a string or an object value for the log event record field so we need to handle that when unmarshalling the json.

object value:

{
    "time": "2021-10-20T08:13:03.278Z",
    "type": "platform.end",
    "record": {
        "requestId": "61c0fdeb-f013-4f2a-b627-56278f5666b8"
    }
}

string value:

{
    "time": "2021-10-20T08:13:03.278Z",
    "type": "platform.fault",
    "record": "Unknown application error occurred\nFunction<Exception>\n"
}

Resolves #54

[ghost]

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• Start Time: 2021-10-21T07:43:57.407+0000

• Duration: 6 min 29 sec

• Commit: 21780c1

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Total	66

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[astorm]

👍 Does the thing, has tests, looks great.

[astorm]

Just noting the introduction of a new third party dependency. Project seems well represented by GitHub stars and has a number of tutorials written about it. 👍

[astorm]

Presuming these all come from the inclusion of stretchr/testify 👍

[estolfo]

yes