feat: Log Step Function State Machine events

[Jimlinz]

We should probably be logging Step Function State Machine events to CloudWatch. This would help with troubleshooting.
This complies with AwsSolutions-SF1.

Example log snippet:

{
    "id": "4",
    "type": "LambdaFunctionStarted",
    "details": {},
    "previous_event_id": "3",
    "event_timestamp": "1668385713883",
    "execution_arn": "arn:aws:states:ap-southeast-2:12345:execution:processinggeostoredatasetversioncreation65D71092-W9Bi3T8DiGui:2022-11-14T00-28-33-438Z_59Z1PGC394K1FR4H"
}

{
    "id": "5",
    "type": "LambdaFunctionFailed",
    "details": {
        "cause": "{\"errorMessage\": \"\", \"errorType\": \"InvalidSTACRootTypeError\", \"requestId\": \"ef0b96d2-560b-44fc-9b67-b69f4800b735\", \"stackTrace\": [\"  File \\\"/var/task/geostore/check_stac_metadata/task.py\\\", line 102, in lambda_handler\\n    validator.run(event[METADATA_URL_KEY])\\n\", \"  File \\\"/var/task/geostore/check_stac_metadata/utils.py\\\", line 155, in run\\n    raise InvalidSTACRootTypeError()\\n\"]}",
        "error": "InvalidSTACRootTypeError"
    },
    "previous_event_id": "4",
    "event_timestamp": "1668385717164",
    "execution_arn": "arn:aws:states:ap-southeast-2:12345:execution:processinggeostoredatasetversioncreation65D71092-W9Bi3T8DiGui:2022-11-14T00-28-33-438Z_59Z1PGC394K1FR4H"
}